Air Only Blows Out Of Defrost Vents


If anyone has had this happen before I would appreciate some help because I do not know how to fix this problem. 0 diesel blow only out defrost ports and not from vent or floor What is going on? you have a vacuum leak. No matter what setting it's on, or speed, it all comes out the defrost vents. Re: Clicking sound behind dash and air conditioner only blows through the defrost vents Post by greg. I noticed that the cold A/C blows out of the defrost vents against the windshield even when the defroster is set to off. The fan worked fine and the air was cold, I just couldn’t direct it out the front air vents. My battery went dead on me a couple of times and I got it jump started. my truck does the exact same thing, only the air blows out fine, but when accel hard or pulling up a good size hill air stops blowing out the vents or floor where ever i have it setting and blows out the defrost. I know your post says A/C, but a lot of people use A/C as a descriptor for both heat and cooling. I live in Florida. Air only blows out of defrost vents. Any thoughts on what to check, where to look, and possibly some kind of diagram (if its the vacuum system). When the heat is turned on and set to floor position, the same thing happens. DIY 1$ fix for the air been blowing from the defroster vents: Air con blowing out of defrosters and not through the vents: A/C blows through defrost vent: A/C, Heat, Fan, etc only blows out defrost vent: The heater/ac only blows out the defroster vents. - Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum. Heat works fine if I turn up the temp, if I turn it down, the AC works fine, I can tell the recycle works, outside air works you can hear the difference and increase in flow for recycle and a little bit of temp change on outside air, but it will not send the air out the dash vents, or floor no matter what mode setting I select. I have the electronic controller in the cab that adjusts the air conditioning. 5 Dodge Ram 3500, and it will only blow air from the defrost vents. i have a 1998 suburban 1500 2wd and my ac vents only come out from the front and it isnt cold During the process something happened and as a result, now the vent air only blows out the middle no matter which direction. Now I'm really. Subject: Vent Control question IP: Logged Message: Ive got a 95 dakota, and the vent control only allows air to blow out of the defrost vents. no matter what setting i put the dial to, my heat and a/c only come out of the defrost and foot vents. It only works on the front vents and floor vents. Mine was broken completely off with just a nub sticking out. If it's working on 1/2/3 for a little while, and it varies how hard the air comes out of the vents, then the Blower Motor Resistor is on its way out. However; I noticed on the Heat/Defrost Door Actuator, the Door Pivot Connection was disconnected. Defrost fan is blowing as strong as ever, but no air coming out of defrost vents by windshield. I have torn apart the interior panel and disconnected the cables and worked them manually (no help). The AC blows perhaps twice as hard as the "heat". There is a resistor pack on the unit outside in the generator compartment. The vacuum pump may also run excessivly. Jun 11, 2017 at 12:56 PM #1. If the hoses are wraped around the rod, inspect for damage to the hoses. My A/C is blowing cold but only thru the defrost vents. cool ill look i have the whole dash off the car still and i was also wondering why the vents for the rear only blow cold air when the heater is on and when i turn the heater on and the ac at the same time i get heat out of the defrost and very cold air out of the rear vents any ideas?. I had into Nissan Dealer and they quoted $1800 - $2200 to possible quote blower motor or cable. I get good heat and air conditioning from my front vents, but when I select floor or defrost vents, the air still only blows from front vents. Switching to air coming out of the dash vents probably only directs 10% of the air through the dash vents with the other 90% still coming out from below. The fact that you can't terminate air flow at the vents, however, would not really fit. Something happened last night and the air started blowing but after about 30 minutes no air blowing. Air only blows thru dash vents, no defrost or floor heat 2011 F250, (gasser, company truck) Air only comes out of the dash vents regardless of what temperature. AC stuck blowing only out Defrost Vent I have a 2005 Magnum and just last week, I set the ac to flow out the Defogger to clear up some fog on the windshield, and now I can not get the AC to flow out of any other vent with the switch. Does anyone have any ideas as to what the problem is before I go ripping into the dash. Any help would be appreciated. Not sure about your exact model but a lot of these are vacuum actuated. But about a week ago air just stopped coming out of all the vents and would only come out of the defroster vents. When you chose "auto" then it will blow in your FACE. I have removed the dash only to find a set of cable that come from the back of the vent a/c will only blow out defrost vents. The air is only blowing out the defrost vents because it is a default mode. My 2000 Nissan Altima is only blowing air from the defrost and feet. This is what it would do through the 4 dash vents before it. Lower the glove box and inspect the vacuum lines to see if they are wraped around the panel/floor door actuator rod. Is it some thing to do with a vacuum line. It gets vacuum, but will not blow out other vents. 3L Power Stroke Diesel - AC only blowing out defrost vents - As the title implies, that is my problem. If the hoses are wraped around the rod, inspect for damage to the hoses. Jun 11, 2017 at 12:56 PM #1. Either that or is there someway to just over ride the vent selector and lock it into the vents. SOURCE: climate control system only blow air out defrost vent there is a good chance that you blend air door is stuck closed over your heater core and therefore not allowing the heat to flow, also your door that opens and close your direction of flow from the floor ,das,vent and defrost. The AC is only blowing out the defrost vents Question: The AC is only blowing out the defrost vents and not the front AC vents. It don't matter when I turn my air control (foor, front, defrost) the air still only comes out of my defrost at the winshield. My car has an automatic transmission. no longer work in car, what could be the problem?. I replaced my battery yesterday, and now my a/c only blows air out of the defroster, the floor vents, and the backseat vents. Now, immediately after changing the IAC Valve, I can only get air to blow out the defroster and floor simultaneously. I have a 2000 Chevy Astro Van that the AC just suddenly started blowing through the defrost vents only. Now I'm really. Keep in mind that another reason your heat pump vent may blow out cold air is because it may need to defrost once turned on. AC stuck blowing only out Defrost Vent I have a 2005 Magnum and just last week, I set the ac to flow out the Defogger to clear up some fog on the windshield, and now I can not get the AC to flow out of any other vent with the switch. The vents are on the sides of the dash, you pretty much have to open the doors to see them. Seems to have a mind of it`s own. If there is no vacuum from the engine to the dash, or if the valve in the dash is leaking that vacuum then it will default the diverter door to blow air out the bottom and top vents only. What you have is a vacuum leak. I am about at whits end. What could be the problem?Optional Information: 2001 Jeep Grand Cherokee Answer; Automatic Climate Control: This is a common issue with the the Grand Cherokee's. Being in Arizona, it will be 100'+ for the next 4 months, I do not need the defroster. My blower speed works fine. 1998 chevy silverado air comes out of the defrost vents only Chevrolet Forum - Chevy Enthusiasts Forums > Chevy Trucks, SUV's,. Jetta Hvac control problems. Post by Kolb » Tue Jul 12, 2011 7:42 pm Hi, I have a 2001 Ford Taurus and recently I cant get the A/C or Heat to blow through any other vent except the defrosters. A few minutes later, it stops blowing out of the vents and blows out of the defroster. It blows through the defroster and can be switched to floor vent, just not dash or dash/floor. The air recirculate button on the control; panel will only blink and then go out if pushed. I'm having a weird problem w/ no air coming out of the center AC vent that's to the immediate right of the Nav display I've cycled through all of the. I did a lot of work on the car over the summer so I remember the recent vacuum readings. Heat works fine if I turn up the temp, if I turn it down, the AC works fine, I can tell the recycle works, outside air works you can hear the difference and increase in flow for recycle and a little bit of temp change on outside air, but it will not send the air out the dash vents, or floor no matter what mode setting I select. Passenger Cars, Mini Vans, SUV Service and Repairs. Air Will Not Blow Out Vents. I have a 2001 Ford Ranger XLT regular cab 2. The A/C clutch doesn't engage when switch is turned on either. This system should be using vacuum from the engine to open and close the air diverter (blend) door inside the dash. It's worth a try. Heater working but only blows out front vents. I have a 98 wrangler sahara and the air tries to blow out of the vents when I switch it from defrost. No matter what position the dial is on the air refuses to blow through the front vents for the driver and passenger. Fan Only Blows Defrost, Won't Change To Floor Or Vent. AC stuck blowing only out Defrost Vent I have a 2005 Magnum and just last week, I set the ac to flow out the Defogger to clear up some fog on the windshield, and now I can not get the AC to flow out of any other vent with the switch. needing some help on this. all fan speeds work. I noticed that the cold A/C blows out of the defrost vents against the windshield even when the defroster is set to off. My 2012 Jeep Liberty's air conditioning is only blowing out of the defrost vents not anywhere else. Before replacing Heater Control Unit, it would only blow hot air from front vents- With this replacement it will now change from cold to hot and the air flow pressure does change from the front vents when changing the setting. Then also when my A/C is on my car has a tremble/idle problem, especially when at a stop light/stop sign. My heater won't switch between defrost, floor heat or vents. AC/Heater air only blows out defrost and far left/far right ventWhy?? 04-25-2017 11:01 AM #1 So when I turn on the blower fan and no matter where I put the ac/heater selector the air only blows out the defrost vent and the outer edge dash vent swhat makes it do this and how to I get airflow thru the center dash vents. I heard about another one that was doing this and all they did was turn off the car and then restart it and it started working again. And you can adjust how much air and the temperature as well still. BTW, that is antifreeze in the hoses and it is supposed to be there. Could this be a relay also located with the fuses?. Hello, on this particular model of vehicle they have whats called a blend door actuator in the HVAC. i air only blows out of defroster vents - Turbo Dodge Forums : Turbo Dodge Forum for Turbo Mopars, Shelbys, Dodge Daytona, Dodge SRT-4, Chrysler PT Cruiser, Omni and more!. defrost is the default when a vacuum leak is present. 6 Recently the AC has started blowing scolding hot air out of the side vents and the defrost vents while the center vents are ice cold. com! We are the oldest and largest V6 Mustang forum on the internet. Air will blow out of all other vents. i recently had and engine fire and had to replace vac lines and brake booster. Seems to have a mind of it`s own. DIY 1$ fix for the air been blowing from the defroster vents: Air con blowing out of defrosters and not through the vents: A/C blows through defrost vent: A/C, Heat, Fan, etc only blows out defrost vent: The heater/ac only blows out the defroster vents. all fan speeds work. This 1996 Chevrolet S10 came in with the complaint that the heater/ air conditioner air only blows out of the defroster vents regardless of where it is commanded. Then after about 5-10 mins it kicks to the defrost setting only blowing air out there If it's only working on setting 4, and NOT on 1/2/3 then you need to replace your Blower Motor Resistor. Does it with center dial on 3 dot cold, Auto or Manual, hot air only out drivers side defrost & floor vent, anytime temp setting is below 75, with or without A/C on. I have been told it could be a Mode Actuator or a Blend Door Actuator. How do you fix A/C only coming through the defrost vents? A/c blows cold, but just a little bit comes out of vents same with defrost or heat? Car vents/heat/defrost/a. After moving the doors for the 10 minute drive to work it slowed down. My car has 96000 miles. All the air comes out of the defrost vents but none comes out of the front. I have a 1998. "Defrost only" easy fix. my truck does the exact same thing, only the air blows out fine, but when accel hard or pulling up a good size hill air stops blowing out the vents or floor where ever i have it setting and blows out the defrost. I have a 2003 Dodge ram 2500air only blows out the main vents, won`t switch to defrost or floor ventsWell not all the time. Mine is very similar in that hot air blows out the passenger side only. Air only blows out of front vents (not from bottom heater or defroster) on 2002 Buick LeSabre I am only getting air to come out of the front vents of the dash. Air only blows out of defrost vents. i've dealt with this problem before but now it only. SOME air passes through the face vents, but it's obviously not what it should be. How do I replace it? I only have air at the vents, no defrost or heat at floor. I did a lot of work on the car over the summer so I remember the recent vacuum readings. BIG PROBLEM to say the least. I heard about another one that was doing this and all they did was turn off the car and then restart it and it started working again. Passenger Cars, Mini Vans, SUV Service and Repairs. I noticed a few days ago that 2012 lt want pushing air out of the defrost. info on your HVAC and. Do you really want hot air in your face ? If you leave it in that mode, expect your windows to start fogging up ! Hope this helps !. 8 motor in it. Air always blows out the Defrost and AC vents 50/50. Before replacing Heater Control Unit, it would only blow hot air from front vents- With this replacement it will now change from cold to hot and the air flow pressure does change from the front vents when changing the setting. What could be causing this issue? My car has 70150 miles. When running the A/C, heat, defrost, or vents only, the air will only blow out from my dash vents on any direction setting. I looked at my wis cd with no luck because mercedes uses different terms and IS DIFFICULT TO FIND. turn it to air the compressor kicks but doesent blow cold air. It works on all setting except for vent where it's just blows out of the side vents that face the driver and passenger windows. SOME air passes through the face vents, but it's obviously not what it should be. The vacuum pump may also run excessivly. Do you really want hot air in your face ? If you leave it in that mode, expect your windows to start fogging up ! Hope this helps !. Now that stopped and it only blows from the defrost vents above the dash-board. It does this no matter where the temperture is set on the drivers side. Happens on both sides no matter which temp, blower speed, or vent selection. So, this morning it started to come back out of the defrost vents while in vent mode. The air is only blowing out the defrost vents because it is a default mode. Did that, presto, problem solved! Take the junk out of the glove box, squeeze the sides, and let it flop down. if the pumps running i'd look for leaky hose or hose off somewhere. Where are the vacuum lines for the front vents? A. Just started blowing A/C air out of the defroster vents, with a small amount coming out the center console and the left and right upper vents near the side windows. No matter what setting it's on, or speed, it all comes out the defrost vents. 0 diesel blow only out defrost ports and not from vent or floor What is going on? you have a vacuum leak. No air from floor vents or defroster vents, only front vents. The air for heat/AC only passes through the feet vents. Wife's 2009 acadia blowing out of defrost and floor vents only. Billy Dodge Dakota JOIN HERE 5. See if this fixes the problem. Normally it is a Ford part buy you should be able to find it at NAPA or other auto parts stores. turn it to air the compressor kicks but doesent blow cold air. If it’s rising, and the heat pump shuts off once it reaches your desired temperature, then the heat pump is doing its job. Re: AC won't fully switch to blow out dash vents. 8 Reasons Home Air Conditioner is Not Blowing Cold Air. No matter what I turn the knob to it just comes out them places. My battery went dead on me a couple of times and I got it jump started. When you chose "auto" then it will blow in your FACE. To my knowledge its doing this because either the vacuum pump isn't working or there is a leak somewhere. However; I noticed on the Heat/Defrost Door Actuator, the Door Pivot Connection was disconnected. 2001 F250 Ac Blows Out Defrost. My C280 seems to have developed a bad actuator motor MB calls it a stepper motor in the plumbing vent work. I know your post says A/C, but a lot of people use A/C as a descriptor for both heat and cooling. But the air only blows from front vents towards face; even if i press button to defrost or floor or frontnfloor. Air always blows out the Defrost and AC vents 50/50. Air only blows out from front windshield vents. So I replaced by air cabin filters. I have no air coming out of my front air vent of my 02 gmc, Yukon Denali. I only have 62000 miles on this thing, and I'm about ready to take it a junk yard. I would try switching the vents on your 88 with the car off and the key in the on position you should hear a hiss until you loose all vac. No clicking when trying to change options. If I put the AC on (max AC or whatever it says all the way to the bottom left of the dial), it works fine and blows cold. It routes or allows EITHER HOT air from the heater core OR COLD AIR from the AC coil to flow through the HVAC system. You can hear the air slow down then start again when switching to different options. SOURCE: climate control system only blow air out defrost vent there is a good chance that you blend air door is stuck closed over your heater core and therefore not allowing the heat to flow, also your door that opens and close your direction of flow from the floor ,das,vent and defrost. Is this normal or anyone have a solution? Thanks. 98 Durango only blows thru the defrost vents and not thru the main vents in front of driver and passenger, know matter what setting it is on. Once the air stops blowing thru the console vents , then you can increase the fan speed setting to the desired level. I have the electronic controller in the cab that adjusts the air conditioning. If your power went out recently, keep in mind. I've read where this topic has been covered previously but with resolutions that did not work for me. When putting it onto front windshield defrost, it only blows from the front vents instead. The AC is only blowing out the defrost vents and not the front AC vents. The air will stop blowing out of the vents, but I can here the fan blowing hard. the cols AC would only blow out the defrost vents and actually freeze the inside of the windshield. Is it something that can be fixed, orwill it require some new parts? My '98 does that too. If it’s rising, and the heat pump shuts off once it reaches your desired temperature, then the heat pump is doing its job. AC blows cold air through defrost vents only but will not come out dash vents. It only works on the front vents and floor vents. Any help would be appreciated. I recently had the battery changed on my 2003 suburban and now the air only blows from the defrost. It isn't coming out of the top defrost vents when it does this. only blows air from defrost vents. no longer work in car, what could be the problem?. all fan speeds work. If you're attempting to use heat and the car's heater core hasn't fully warmed up yet, it will only blow from the defroster and very slightly from the legwells. well my heater core went out and i bypassed it to stop the leaking of coolant. - Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum. air only blows out of defroster vents. Is it something that can be fixed, orwill it require some new parts? Thanks a ton. Then I proceeded to watching each actuator while someone ran the controls and all actuators worked which leads me to believe that I have good vacuum on all of them. Air only blows through defrost vents, cannot change heater settings, Escalade, Avalanche, Silverado, Suburban, Tahoe, Yukon, TSB, #04-01-38-008 GM has issued a technical service bulletin (TSB) #04-01-38-008 to address problems with the heating system, blower control, and airflow on the following models:. Is it some thing to do with a vacuum line. Before replacing Heater Control Unit, it would only blow hot air from front vents- With this replacement it will now change from cold to hot and the air flow pressure does change from the front vents when changing the setting. You can hear the air slow down then start again when switching to different options. the cols AC would only blow out the defrost vents and actually freeze the inside of the windshield. ? When I turn the mode selector dial (from defrost to "face"), I hear something going on inside, but the air continues to only come out of the defrost vent, even if I have it turned to the front vents or the floor vents. If your car is only blowing air out of the defrost vents, this video might help you understand. The air whistles trying to get out but the vent doesn't open on the inside behind the dash to let the air out. Not a blend door problem. When I change the air controls to blow through the face vents or defrost, the air still passes through the feet vents only. If you want to restore heat, you will have to put in a new heater core and then hook up those two hoses. I have read that the pcm needs to be reset and I have tried to reset it. Does anyone have any ideas as to what the problem is before I go ripping into the dash. Air Will Not Blow Out Vents. I had into Nissan Dealer and they quoted $1800 - $2200 to possible quote blower motor or cable. My front air does not blow out (it works in the back). Nothing comes out of the dash. Heater working but only blows out front vents. Air was blowing from dash vents while he was driving then all of a sudden it started blowing out of the defrost vents. All air blows from defrost and side vents. The air only blows out of the defrost vents onto the windshield. No heat to feet or defrost. Many people can switch to floor but can't get air out the dash vents (I think your model won't do that unless in cooling mode) due to problems with the vacuum lines in the clear plastic connector at the programmer on the corner of the heater box. With each change of the AC/Heat/Defrost switch on the dash, I can see a corresponding move of the actuator. 2001 Ford Taurus air blowing through defroster vent only. W201 hot air out defrost & side vents when AC is on 1990 190e 2. If it's rising, and the heat pump shuts off once it reaches your desired temperature, then the heat pump is doing its job. Heat works fine if I turn up the temp, if I turn it down, the AC works fine, I can tell the recycle works, outside air works you can hear the difference and increase in flow for recycle and a little bit of temp change on outside air, but it will not send the air out the dash vents, or floor no matter what mode setting I select. The heater vent fan works, but only on the two highest settings, which is not a big problem. the blend door is what controls hot/cold air, by blending how much goes thru the heater core. It only seems to blow through the defrost. Also my air only blows out the defrost vents and the floor vents. There always seems to be a disportionate amount of air coming out of the floor vent on the right of the console as well as those on the floor that you can not shut off. it also most feels like its blowing harder now but on the defrost tested with a temp gun only getting about 73 degrees out of it. Is it something that can be fixed, orwill it require some new parts? My '98 does that too. 1999 - 2003 7. "Defrost only" easy fix. First it was blowing normally from the dash but during acceleration or under load, the a/c would randomly blow from any vent, from the floor, dash, defrost. My air conditioner and heater on my 1997 Mustang will only blow out the defroster vents. Air only blows through defrost and floor vents I have a 2002 GMC Yukon that has the air only blowing through defrost and floor vents. My 2004 F350 diesel started blowing air out of the defrost vents only. I looked under the drivers side of the dash tonight and it looks like the blend actuator is operating correctly. turn it to air the compressor kicks but doesent blow cold air. Also, recirc does work as it gets a lot louder from the sound of sucking the air in from inside the cabin, and I can direct air to the defroster. The air recirculate button on the control; panel will only blink and then go out if pushed. I took it to my local 5 star dealership where they predictably. And you can adjust how much air and the temperature as well still. i recently had and engine fire and had to replace vac lines and brake booster. Air Will Not Blow Out Vents. Lost - N - Found 18,481 views. This is on a 2003 GMC Yukon and it does not have the auto airconditioning, it is the manual dual zone. AC stuck blowing only out Defrost Vent I have a 2005 Magnum and just last week, I set the ac to flow out the Defogger to clear up some fog on the windshield, and now I can not get the AC to flow out of any other vent with the switch. It is actually a pretty simple problem and strangely enough it is not an electrical problem. i recently had and engine fire and had to replace vac lines and brake booster. The AC blows perhaps twice as hard as the "heat". Air only blows out from front windshield vents. All the air direction doors are vacuum controlled, and if you lose the source vacuum, the default is to blow out the defrost, so that your windshield stays clear. My battery went dead on me a couple of times and I got it jump started. It may be not working the compressor, AC cycles are based on compression and expansion of refrigerant gas, if your compressor is not working it may not be cooling the air, if there isn't any air blow (not even warm air) it could be a fan issue, check by yourself under the hood if both of the fans are working or it does any sound when you turn it on, if it doesn't also could be a switch problem. your going to have to remove the lower cowling of the dash on the passenger side analso some of the center. Depending on system design, you either (A) have a heater control valve stuck in the open position, thereby causing heat to flow through the system at all times. Air flow only blowing out of the defrosters on Wranglers On 1997 through 2006 Jeep Wranglers the air flow from the air conditioning will stop blowing out of the a/c vents, and the floor outlets. SOURCE: climate control system only blow air out defrost vent there is a good chance that you blend air door is stuck closed over your heater core and therefore not allowing the heat to flow, also your door that opens and close your direction of flow from the floor ,das,vent and defrost. defrost is the default when a vacuum leak is present. 5 Dodge Ram 3500, and it will only blow air from the defrost vents. Any help would be appreciated. I have a 04 silverado 1500, and the ac will only blow through the defrost vents. My heater won't switch between defrost, floor heat or vents. Learn more about Chrysler Town and Country at the Edmunds. I have a problem with my air blowing out the defroster and floor but not the main vents on my 2000 pa. Fuses were checked at the engine compartment and under the rear seat. It may not be relevant but it seemed to start after plug and wires where repalced, is there a vaccum that could have come loose and caused this. air only comes out of my defrost 28 Answers. So cold in fact it spits water out from the condensation at times. ? When I turn the mode selector dial (from defrost to "face"), I hear something going on inside, but the air continues to only come out of the defrost vent, even if I have it turned to the front vents or the floor vents. After moving the doors for the 10 minute drive to work it slowed down. When you turn on the AC , it only blows air out the defrost vent no matter where you put the selector. When putting it onto front windshield defrost, it only blows from the front vents instead. The air conditioner blows out cold, but it will not blow through the dash vents or the back seat vent. With each change of the AC/Heat/Defrost switch on the dash, I can see a corresponding move of the actuator. Any ideas?. Air only blows out from front windshield vents. No defroster air or air going to the floor. Air conditioner blows out the defrost vents only. I have a 2000 Chevy Astro Van that the AC just suddenly started blowing through the defrost vents only. I'm having a weird problem w/ no air coming out of the center AC vent that's to the immediate right of the Nav display I've cycled through all of the. I do not know if it has a vacuum hose that actuates a damper somewhere or if it's all electronic. Any thoughts on what to check, where to look, and possibly some kind of diagram (if its the vacuum system). No defroster air or air going to the floor. when i flip to the front vents its coming out about 50 degrees so huge difference just not sure why heat blow out defrost and not other. - Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum. With each change of the AC/Heat/Defrost switch on the dash, I can see a corresponding move of the actuator. I replaced and refilled the A/C last summer so I don't think the compressor is bad. I looked at my wis cd with no luck because mercedes uses different terms and IS DIFFICULT TO FIND. I did a lot of work on the car over the summer so I remember the recent vacuum readings. Either that or is there someway to just over ride the vent selector and lock it into the vents. Post by Kolb » Tue Jul 12, 2011 7:42 pm Hi, I have a 2001 Ford Taurus and recently I cant get the A/C or Heat to blow through any other vent except the defrosters. My A/C is blowing cold but only thru the defrost vents. turn it to air the compressor kicks but doesent blow cold air. A/C will only blow through defrost vents What Happened?!? I turned on my A/C the other day and for some reason on every setting, it only blows up on my windshieldas if it's going to defrost it. Before replacing Heater Control Unit, it would only blow hot air from front vents- With this replacement it will now change from cold to hot and the air flow pressure does change from the front vents when changing the setting. AC stuck blowing only out Defrost Vent I have a 2005 Magnum and just last week, I set the ac to flow out the Defogger to clear up some fog on the windshield, and now I can not get the AC to flow out of any other vent with the switch. If one of the vac lines is broken, leaking or disconnected this will happen. 99 silverado HVAC WONT BLOW AIR THROUGH BLOW AIR THROUGH DASH VENTS WHEN PUTTING KNOB IN THAT POSITION that position. I have a brand new climate control, and all vacuum lines are good beneath the hood. Actuator works fine. The defroster setting is an indication of NO vacuum. When i start the car up it cycles through the floor board, then the normal face vents and then ends up only blowing from the defrost. You can hear the air slow down then start again when switching to different options. Not a blend door problem. Gear Parting Out. It routes or allows EITHER HOT air from the heater core OR COLD AIR from the AC coil to flow through the HVAC system. i have no amc codes so i dont know where to start. 1990 190e 2. So, this morning it started to come back out of the defrost vents while in vent mode. Yes, those knobs are all open, in fact closing them turns the output from 10% to 0% so I know they work. I replaced the control panel and still the same problem. Fuses were checked at the engine compartment and under the rear seat. 8 Reasons Home Air Conditioner is Not Blowing Cold Air.