” Car AC Not Blowing or Is Your Car AC Fan Not Working? If your car’s AC isn’t blowing air, it could be a problem with your car’s fan. 25 Jun 2014 So if air is blowing out of your vents but it's not cold, it could be that the circuit breaker has tripped or the fuse has blown on the electrical circuit 21 Oct 2010 The A/C system switches from vent to defrost mode under engine load (going uphill or overtaking another car). If it’s not the relay, your thermostat likely has a shorted cable or needs to be replaced. blower motor burns out, you will get little to no airflow through the vents. i am having a problem with the a/c blower not blowing out the front vents. Jun 01, 2017 · Car Tips. If you smell gas every time you turn on your car air conditioner, then your car may have a gas leak Jan 21, 2014 · Hey Guys, I have a 2007 Town Car Exec L. S. A/C isn’t cooling? Troubleshoot these common car air conditioning system problems. Not sure if it's time to call in an expert, or if you can fix the air conditioner yourself ? A new computer the latest cell phone or your car for example. More than likely its a vacuum AC kicks ass again. If you are not sure which kind of system you have either vacuum or How much does Air is not coming out of vents Inspection cost? In most cars, the vents can pipe in neutral air, heated air, or air-conditioned air. the blower motor works fine and so does the speed of the blower motor Oct 15, 2012 · Im having same problem with my aircon, my red light is constantly on and i can hear the AC on when i stop with the engine on. If your car AC blows cold then warm, the cause can be a low system charge, moisture in the system, a malfunctioning expansion valve, clogged evaporator fins or an overcharge condition. Some smells are merely irritating while others are hazardous. However, if there is a problem with the AC , even normal usage can cause it to overheat. Sep 01, 2008 · Thanks for all of the good advise re vacuum lines that control the AC vents and the cruise control on a 2002 Cherokee. any vehicle that I have ever owned, not only the A/C system blower but the cruise control, window master switch (recall), 7 Aug 2018 How to fix it: Switch your thermostat to AUTO (see image below), so air only blows from your vents when the AC is cooling. The fuses may be blown, or the heating coil is not working correctly. There are exceptions. The air conditioner won’t run properly unless your engine is running. If it is, pull the broken pieces out and put the bottom back on. May 22, 2014 · Switching on the car’s AC has become such a common action today, you almost do it as a reflex, just like you close your eyes when sneezing. Low car AC charge causes evaporator freeze up and low airflow Sounds like the main problem is a vacuum leak. Stuck air vents tend to indicate a problem with your mode control motor. The vents can be used by mounting them in the dashboard or by using the under dash adapter to mount them under the dashboard. It all depends on if the lights are lighting up when trying to Dec 09, 2019 · I recently found out that my HVAC controls are not actually switching the vents well at least not fully. Ok for some reason my car blows out heat out of the vents when im in motion say like going 35mph. This will help evaporate the water on the coils of your unit. However, if the air coming from your AC vent is smelly, you might have a serious problem on your hands. The problem can be as simple as a blown fuse, or you may need to replace it. Step 1: Turn on the AC. OP, when you turn the reds on your car, does your AC red light not go on even when you turn heating on. May 14, 2018 · The Main Causes of Car Smells Like Antifreeze but Not Overheating. May 31, 2017 · If it is lighting up but not switching at all then this is usually the mode actuator at fault. Try switching to dash only, see if that makes a difference. Home » Frequently Asked Questions » Why Does My Air Conditioner Turn Off After About 15 Minutes? AC is meant to come on and stay on for at last 10 – 15 minutes, often much longer. a compressor can cost up to $3,500 to replace ). There are a lot of mails and photoes to illustrate it Just type " changing AC Blender motor windstar" or "HVAC system windstar" on net search 25 Jul 2014 air conditioner heat pump furnace supply vent register. Blowing air out the defroster is the default setting of the switch. Now it is working like it should and Your car's defroster is needed to keep the inside of the windshield from icing up in cold weather. When I picked up the car the AC worked great, it was a short drive home so I didn't notice the problem. Leaks; Clogged, corroded or damaged fins or tubes; Poor air conditioning performance 25 Jul 2015 Here is a list of some common car AC problems and their possible causes. When it's warm, which is 90% of the time, I either have the windows down or the AC blowing through the face vents. Check for vacuum leaks first. It’s not a big deal in the winter but last summer it was uncomfortable. Check compressor clutch wiring, electrical connections and compressor clutch, and repair or replace as necessary. Both the heat and air work, its just that when I flip the controls to switch from defrost to ac or heat to have it blow out the cabin or floor vents, nothing happens. Jan 01, 2008 · The fan is on and i can hear it running but no air blows through the front vents - it seems all the air is blowing through the back vents. Electronic Blend Door Actuator is not functioning which would only allow warm air to pass through vents. Nov 30, 2017 · After installing a new blower fan motor the ac would only come out the defrost vents. I've found references to If your car’s air conditioner isn’t working properly and is blowing hot air then one of these systems isn’t doing its job properly. Closing AC vents damages your AC system Remember how a PSC blower produces less cool air when an air vent is closed? Well, less airflow in your AC system can cause your evaporator coils to freeze over and eventually destroy your compressor (P. I have plans to fix it better and insulate it better but have to many irons in the fire right now (facing a move to DC). I am not sure about the cracking, but the AC blowing on a hot windshield should not damage it. 18 Jul 2017 Is your AC blowing warm air due to a small problem you can fix yourself or Is it possible that vent grilles were closed over the winter and never re-opened? It's not uncommon for damage to occur during construction projects, There is one thing you can check, however: your emergency shutoff switch. There may be several reasons why the air only blows out the front vents and not on the floor or the defrost on the 2003 Dodge Ram. When you loose vacuum the ac/ heater will default to the defrost position. Also when switching from defrost to vents, it takes a minute to switch to vents. side I am also getting cool air though the defrost. and restart again. I changed check wall but not the vacuum reservoir. The car has "two" Actuators for the AC one for heating under the passenger side dash and a similar actuator without the small arm attached to it for the vent control, under the drivers side dash (no dismantling required for either) you'll see the track. The Nash-Kelvinator corporation used its experience in refrigeration to introduce the automobile industry's first compact and affordable, single-unit heating and air conditioning system optional for its Nash models. The AC is governed by the settings of the thermostat, so if you have set the temp quite high, suppose at 27℃, then the ther Air conditioner compressor clutch not engaging. Any suggestions? Thanks, John. If your air is blowing cool but not cold, the problem could be a clogged filter, cooling fan problem, radiator trouble, or it could simply be that you need to recharge your AC . Turn the car’s fan motor on high and press the button to turn on the AC. Also if you have dual zone climate controls then that can also be adjusted to optimize the cooling. coming from the AC vents hits the warm moist air in the cabin of the vehicle, 6 Aug 2015 4 – Your car may be low on R-134 refrigerant or Freon. so eventually i checked the vacum line under the dash behind the ac switching control panel (EATC) and found Nov 20, 2019 · Same as when there is air duct blockage it will restrict the flow of air from coming out of the car air conditioning vent, the reason for this is because of the closed or nearly closed air doors that are stuck inside of one of the air conditioning ducts preventing enough amount of air from coming out the car ac vents, it is also possible that an accumulation of debris like leaves from a fresh The floor vents and the defroster vents work fine. There is a vacuum switch that controls an air gate that diverts the air flow to the proper outlet. which include the HVAC controls on your dash, the vents you use to direct airflow and the fans that circulate cabin air. when I pull back the carpet just under the dash I feel cool air coming in on the pass. With the recent "cold" weather and the rain, I've been needing to use the defroster and the heat. Sep 08, 2005 · Help! Recently my air conditioning started blowing out of the defrost vents in front of the windshield. It blows almost the same amount of heat out as when i actually do have the The vents (louvers) we sell are all made of ABS injection molded plastic. Jul 15, 2018 · The most common reason that your Air Conditioner fan won’t turn off is because a stuck relay keeping the circuit closed. that your AC suddenly stopped working or switched to blowing warm air. 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 dial but there is still no air at all to feet and defrost. Aug 01, 2012 · I have a 1998 Chevy Lumina. i dont think there is anything too major wrong with my car because the ac blows out cold air, but it won't blow out of the front vents, only near the windshield and by my feet. If an electrical problem keeps it from Air Conditioning will not blow out of front vents on Buick Rainier Front air vents only work if AC is on when car starts. It can be one of the general issues if AC is not cooling enough. You are DONE! I have not had any more "switching issues. Chances are that it happens due to an internal or external coolant leakage or a leak in the radiator cap. 13 Feb 2020 Vehicle dashboard controls and air vents with a hand feeling for air output resistance ground to the blower, from the dash control switch and it 6 Aug 2018 So what should you do if your AC suddenly stops working? the AC is turned on at the thermostat, and that it is switched to “cool” rather than to 6 Reasons Why Your Car's Air Conditioner Might Be Blowing Hot Air. They told me the A/C did not work, but it did, for a few days. com : Car complaints, car problems and defect information There are two components of this question, first is about the AC air temp and the second is the temp under the hood. What we have listed on the site is what we keep in inventory for a/c vents. Most cars do not have AC vents, only climate control vents. If AC is turning off after 15 minutes or less every single time, or even just minutes after it first kicks on, it’s called “short cycling. Loud noises when the compressor If I set it on dash only all vents work fine. Jun 25, 2016 · This 2007 Lincoln Town Car came in with the complaint that sometimes the a/c air would not blow out of the face vent. With the air on. But the next day when I drove it for an hour I noticed that after about 20-30 mins of driving the car, air, cold or otherwise, stopped coming through the vents. Then today I turned it all on then went back in my home to grab some stuff, got in it was cool but the vents weren't working. maybe the ducking up to the vents in dash wiggled loose I was thinking about removing the plastic cover just under the glove box and on my 95 S10, the dash vents will no longer blow air out of them when you switch it to the vent position. A licensed and experienced HVAC professional can inspect all the ductwork and registers of your air conditioning system on a regular basis, ensuring the entire system is in proper working order. Sorry if I use the wrong lingo. If the mildew has already formed, spray Lysol antiseptic into the exterior air vents with the AC set to pull air from the outside. A/C isn't cooling? Troubleshoot these common car air conditioning We all want the ultimate chill blasting out of our vents; especially when it comes to The evaporator is like a mini radiator (not to be confused with the heater core — they The auto industry has since switched to the CFC free R-134a. Most common causes of this Jul 13, 2017 · Car AC blows cold then blows warm Car AC blows cold then warm. 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. It is very strange that it worked fine before replacing the battery and now the AC just seems to be stuck on that mode and the button to switch to other vents doesn't respond. 2. Just this past month I am unable to redirect air out the AC vents. By simply adjusting the vents, the air conditioner will produce more or less air in occupied rooms. There are also a few maintenance procedures that can improve When you turn on your air conditioner for the first time, you expect to be greeted by nice, cool air. Your AC vents push cold air out, but the air tends to settle instead of circulate. It is still blowing cold air but will not come out of the regular dash vents. i was driving along and the radi Jul 23, 2018 · Switching off the passenger and rear ac vents will considerably increase the air flow in the driver’s area. Lukewarm air blowing from the registers/vents at times, and cold air blowing at other times 4 Aug 2015 Cold AC is one of the biggest perks of any vehicle, but it certainly has your car, turn up the air and get a whole lot of nothing out of the vents 28 Feb 2019 Your vehicle's air conditioning system does not actually create cold air; will carry the foul smell inside of your car through your dash vents. I was sitting stopped, turned on the A/C and it started blowing nice and cold as normal. Is it possible the cracking noise is coming from under the hood? Below is a diagram of the vacuum harness, to give you an idea of how the system works. I've researched and have found similar problems on Dodge Rams. If your car smells like antifreeze but not overheating, the components you should look into are: 1. Hello, on this particular model of vehicle they have whats called a blend door actuator in the HVAC Feb 15, 2010 · 1994 Dodge caravan AC blower will switch air flow to defroster vents upon acceleration. The vents that are on the front of the dash, the ones you can adjust to hit you, they "sometimes" work. Instead the air would flow from the defrost and floor vents. Tried switching the capacitor and contactor from my working AC unit, but same result. Several reasons are there for causing this problem. this happened when it was still under warrenty about five years ago . Which means that they blow what ever air is selected. car AC not working. You can then let off gas move blower switch back to low and when you here door/flap open or close, which ever it … Mar 29, 2019 · Turn the air conditioning on while the car is running. You can diagnose it by yourself. CarComplaints. Thanks in advance, 93lx Top 10 Reasons that your Car AC isn’t Cooling Enough. It blows cold air just fine but I can't really control which vents it comes out of. thermostat ON vs 20 Jun 2018 First: have you made sure the air conditioner shut-off switch (located in Once you've waited, stick your hand over vents to see if you can feel The fan switch may be at fault, but a more likely reason is that a blower motor or fuses for the heating, vent and air conditioning systems is a logical first step. Aug 09, 2017 · Here is my issue and please note, I am not very knowledgeable on cars, but can watch and fix/learn and do things myself. It wont blow air on vent or feet. Any suggestion? Jul 06, 2012 · whats wrong if the front vents in my car will not blow air but the vents near the floor and windshield will? i have a 1996 ford taurus gl. Getting to the root of the problem can take some time and effort, but we have simplified the process by providing you with the most common A/C problems along with how to resolve these problems once they’re discovered. Here’s how to nail down the cause. The correct way to do it is to remove and drain the oil in the compressor, replace the accumulator or drier and flush the old oil out of the system as it is not compatible with R134a. I have had to replace this several times before in the past as well. It’s no fun being stuck without air conditioning on a hot summer day, especially in a hot car where temperatures can quickly reach 150 degrees or more. My ac blows but not seeming to blow hard thru the face vents, I took the floor vent piece alose and blows hard thru it. If you cannot feel any air coming through, try switching between the different speed Either way, when you find your air conditioner not blowing air or not turning on, of ducts and vents based on the driver's selection in their climate control system. Air conditioning not blowing though the vents. The strange thing is that I continue to hear the noise of the device. If so, it is time to get it changed. Home » Repair Tips » Air conditioner not cooling – outdoor unit not running Make certain the thermostat is set to cool and the indoor unit is running (blowing air out the room air vents). I was thinking the mechanic balls my AC up after putting a 2nd hand head into my car. 21 Nov 2018 But behind the dashboard pushing that air through the climate vents is a simple fan called a blower motor. The defroster is part of the heater and air conditioner system Jul 17, 2016 · 1997 4x4 chevy tahoe , GMC Truck , Suburban SUV blend door actuator heat ac for 1990 -1999 part 1 - Duration: 4:12. HOWEVER, the front main vents do NOT blow anything, which is the most important. Derek P I recently had my AC compressor clutch replaced. It is advisable to turn off the car air conditioner for awhile and let the fan run instead for a few minutes. This is an electric motor that moves on the heater/ac box under the dash to switch between defrost, vent and floor modes. During battery replacement, the control module for the mode actuators may lose its memory. Man checking air . Your air The PSC blower will work less but not move as much conditioned air. The AC button has a light on the button that illuminates when the air conditioner is turned on. However, when I switch it to Defrost, the air is still directed through the dash vents and not the defrost vents. Having your car’s air conditioning go out suddenly can ruin your day fast. this was quite irritating during normal driving for me . Today's air conditioning systems do not have a way to visually check the at the vent with an accurate thermometer with a probe that will go into the vent. If not, long-term you'll waste money, be less comfortable and possibly damage your AC. The settings do not seem to switch from Floor to defrost etc. Still today the fan is on but no air coming out front Jun 15, 2013 · Re: Fan Only Blows Defrost, Won't Change To Floor Or Vent. Aug 17, 2016 · Here are some common bad car smells and their possible causes: Musty: If turning on the air conditioner generates a musty smell from the vents, mold or mildew has probably formed in the air I took the car for a drive at highway speeds, turning the AC on and off as I sent, and I am vary happy to say that as of now, the AC is working perfectly. Closing the vents in unoccupied rooms will produce greater airflow in other rooms. Jul 09, 2009 · Vehicle: 2002 F-150 Harley Davidson This started just the other day when i was trying to use my A/C. it is stuck on defrost. In 1954, the Nash Ambassador was the first American automobile to have a front-end, fully integrated heating, ventilating, and air-conditioning system. My car has 96000 miles. Verify if this light turns on when you reach MAX A/C. Oct 17, 2016 · Q: AC only blows out on defrost. Air Conditioning is cars before 1994 used freon called R12 which was found to be harmful to the ozone. The factory vacuum check valve is very hard to get to. Sometimes the air would start flowing from the face vents a few seconds after turning the ignition on but would soon … Continue reading "2007 Lincoln Town Car A/C Does Not Blow Out Vents" Mar 03, 2017 · How to Fix My Car's Weird AC Noises Posted on 3/3/2017 Nothing feels better than feeling the cold air blowing in your car on a hot day, practically a necessity, it is one of the most important parts of any car: a working air conditioner . Owners have reported several instances of the air conditioning not blowing through main dash vents, or only blowing through the floor and defrost vents. My AC works fine in the rear, windshield and floor vents. It can be a safety problem if the defroster is not working or quite uncomfortable if the vents are stuck in the defrost position. 4 Jul 2016 Their reasoning was that the air you suck in is not moist and therefor… package shelf and connected them through a switch on the dashboard. AC system will not switch to Defrost vents 3 Answers I have a 2008 Ford Explorer. This can also be labeled as MAX A/C. Aug 21, 2018 · Make the habit of turning off the air conditioner without switching off the fan at least 2 to 5 minutes before shutting off the car’s engine. 27 Apr 2020 Should you turn off your air-conditioning if someone is sick with coronavirus in your home? and your air-conditioning is on, seal off their room so it's not blowing their lives in built environments like buildings, cars, and public transport, a return vent, blowing it past coils that absorb heat and cool the air. This causes a low-pressure switch to trip and shut down your AC's 29 Oct 2014 The job that your ductwork performs would not be possible without the supply and return vents located throughout your home. But A/C is more than just comfort; it’s a safety issue too. 0. and the driver side is always blowing cold air no matter what the temp is set at. The defrost vents and floor vents have air flow, but no air from the front facing AC vents. Often this is experienced after replacement of the battery. I bought the van last week. In both 15 Jul 2015 Every time your AC comes on, the air leaving your vents stinks with a musty odor. First. Just Open a dashboard holder and remove the Cabin filter if it is dirty then this is the reason that it is reducing the Air inflow to the cabin properly. When im at a stop light i dont feel any air come out but as soon as i start moving the heat starts to come out ALL vents. this problem just started yesterday. When your car heater suddenly stops working, things can get really cold, If cold air is coming out of the heating vents, even when the vehicle is warmed up Low coolant; A blockage in the heater core; A stuck blend door; A stuck heater valve; A bad switch or linkage Is There a Cheaper Alternative to Air Conditioning? 26 Sep 2018 But that soft breeze may not be enough to beat the heat. If this is Find your return vent's filter (the return vent is where air gets sucked into the air conditioner). As it stopped The 2010 Jeep Liberty has 5 problems reported for vents not working. now it doesn't matter if its hot or cold air, it just blows on the floor only. The Heater Core Jul 16, 2013 · Q. (Its cold out) any easy fixes? Thank You. 9 Oct 2018 Not Enough AirThru The Vents?Not Cold Air or Hot?How I Fixed It! 25 May 2015 Heater and a/c blowing out of defrost vents only on jeep 4. My '02 x-type has some really nice and cold air coming out from the AC, but unfortunately, it's all focused on my feet. Pull the bottom off the blower housing off and reach up in the top and feel to see if it is actually broken. Also, the plumbing under the driver's side dash had come apart. I had a 1980 Ferrari that did not come stock with AC. Actually is not just Ford who have this system, other brands have the same vacuum system too, my pontiac does. is there a leak or does it My 2009 Dodge Avenger has been a great car. A damaged or failing compressor will not be able to properly regulate the refrigerant flow in the AC system, and as a result, the AC will not function properly. No heat to feet or defrost. Gas Leak. I switch the vent flow to windshield and cold air blows. To check this filter locate the filter housing which can be either under the dash on the passenger side or under the hood of the car, near the base of the windshield on the passenger side, remove the cabin air filter and inspect. over the condensate pan and triggering an emergency shut off switch) This can not only cause the evaporator coil to get dirty, but can also 22 Feb 2012 Heat and AC both work and fan works at all speeds, but I cannot get the Turn the ignition to on (but don't start the car) and see if the system I now suspect was the actuator) when switching floor/front/defrost vent settings. This will cause the ac air to not be cold but the air will still blow out of the vents. It will keep the system free of moisture. The best setting for diagnosis is “fresh air” (not recirculated) with the air blowing out of the center vents in the dash and the AC turned on. My car has an automatic transmission. Jun 25 2013, 11:47pm Yea the problem with them astro's is the way the damn motor is crammed into the dog house with the heat it destroys the hard plastic vacume line . Aug 06, 2018 · Again, regular AC maintenance is one of the best ways to prevent problems like air conditioner vents not blowing in one room of your house. This article applies to the Honda Accord (1990-2002). My 2002 F-150 AC air flow keeps switching back and forth between the "vent" setting and the "defrost" setting. The problem is that I can control the fan speed, and whether or not the AC is on or off. Has something come loose? What should I look for and how involved is fixing this. When you say the vents do not open, I am assuming you mean no air comes out the vents, but does come out the defrost and floor If this filter becomes clogged due to lack maintenance it will stop or slow the flow of air exiting the vents. The heater and AC work fine. Some vents have a chrome outline or trim for show purposes. Checking for Leaks. Start with the fan speed turned to its highest setting. My air conditioner and heater on my 1997 Mustang will only blow out the defroster vents. Hey John. Most vehicles today have one multi-speed fan that blows air through a series of ducts and vents based on the driver’s selection in their climate control system. Most of this is under the dash, except for the vacuum canister (#6) and the check valve (#7) After replacing with a new one, I turned on the air conditioner and now air only comes out of the dash window defroster vents and not the front,side or floor vents. Feb 10, 2010 · The mechanic who turned me on to this said it was a very common problem and there is an easy fix. Jul 17, 2017 · The vents of the air conditioning system are adjustable to maximize or minimize the flow of cooled air. So i bypassed it. Inject the treatment solution into the air conditioner case. I turned the car off for few min. The most common causes of broken air conditioning are leaks or compressor issues. i had same problem ,in my case the the air would be directed automatically to the defrost vents when im accelerating the car, and would change to the front vents when i lift my foot off the gas pedal and let the car to decelerate. Thanks for your email. of resistors or a small computer module which is controlled by the fan switch. the AC system works fine. Most people don’t even know how the AC work and as a 2008 Suzuki XL7 V6 - AWD - Front vents will not blow hot air or switch vents between floor/face/defrost vents It has happened before but corrected the next time I drove the car. it gets stuck on one setting. After i started accelerating, the flow through the vents slowed and finally stopped. 11 Dec 2013 Picture of a car's temperature switch But if your car heater starts blowing cold air and suddenly stops Why is my car heating not working? 15 Jul 2018 Fan still blowing after a few minutes? Double-check the thermostat and make sure the fan is not set to ON, and that it still runs when switching it to 27 Apr 2017 In short, your air vents should always be open. a/c blower vents not switching 13 answers. compressor is turning. Something happened last night and the air started blowing but after about 30 minutes no air blowing. It gets vacuum, but will not blow out other vents. It seems that simply the air is diverted to other par or stopped from coming into the car cabin. This is the most common reason for why your car's AC is not blowing cold air. I fixed both problems for less than $3 instead of the $250 - $500 the Aug 19, 2019 · Air-conditioning (AC) is one of the many features of a car to make commuting comfortable and is used almost always irrespective if the weather hot, cold, raining or snowing. How to Fix the AC on Your BMW. This may not be everyone else's issue, but I was not ready to shell out $1000 - $1,500 for more AC work and was honestly about to turn this car in to a dealer as trade-in towards something Jul 05, 2018 · The air conditioning of my S80 Volvo car works right for the fisrt hour or so, then the air ceases to flow inside the car, so no more air conditioning. Drews Quick Fixes Ideas And Hacks 169,298 views 4:12 Jan 26, 2016 · Part 1 of 3: Checking the inside of the car. Learn to tell the difference and take the appropriate step to eliminate the odor. Most of these cars can be retrofitted to use R134. 26 Jan 2016 Verify if you are able to feel air blowing through the vents. The reason is because in the event you have any vacuum related problems during extreme weather you might be freezing inside the car but, at least, you can still drive with a good visibility with the defrost option. Alternator Replacement · AC Condenser Replacement · Windshield Wiper Switch Replacement · Air Filter Replacement Volkswagen Beetle - Heating AC - Houston, Texas. Average repair cost is $650 at 92,600 miles. Heater working but only blows out front vents. I had a split in the line, a lil 27 Jun 2017 The defroster is part of the heater and air conditioner system which is On newer cars the vent direction and temperature controls are A control switch on the dash can fall apart allowing the vacuum to escape and not reach the servos. So, I realized that the drivers side vents (the one all the way to the left - by the door - and the one on the right side of the driver (which is the left of the center group of vents) and the one directly in the middle) are blowing warm air - not hot, but like I have the temp turned to cold but do not have the AC button pushed. car ac not switching vents