Our how-to videos have helped repair over 100 million vehicles. Visit 1AAuto.com for quality auto parts shipped to your door. We want to check our test light first. Refer to the fuse legend or the manual to locate the blower motor fuse, Alternatively, use a test light to check the fuse and circuit, If the fuse was burned out, continue with diagnosis, as there could still be problems with the blower or resistor, Locate the blower motor, usually under the passenger side dash, Turn the vehicle power and heater switch on, Use a test light to verify the ground and positive at the wiring harness, If positive and ground are good, the issue is likely the motor and it should be replaced, If the positive or ground were not good, proceed to diagnosing the resistor, Disconnect the resistor module electrical connector, Use a test light to verify positive and ground coming to the resistor, Use a multimeter to verify voltage changes from the fan speed dial, Use the test light to verify the voltage changes occur at the blower motor electrical connector, A worn out or malfunctioning blower motor could cause a resistor module to burn out, A malfunctioning resistor module could burn out a blower motor, If you are replacing one unit, it's best to replace the companion unit as well. That's how a good resistor would look.So, if the resistor or resistor module is not getting what it needs to, to vary the speed of the blower motor, there may be another issue with either the wiring or the switch itself, or even a relay.So, sometimes you're gonna need a blower motor, sometimes you're gonna need a resistor. After a month or two, it may burn your new resistor out.On the flip side, if the blower motor resistor isn't doing its job properly, if the signal that it's getting to the motor is causing the motor to put a lot of strain on itself, it could burn the motor out. Make sure the air filter has been cleaned in the last 30 days. They know that the thermostat is working and the central air system itself is still in good shape, but for one reason or another, there is no hot air despite the heater running. My car has 106000 miles. A bit of background on the working of car heater fans will be helpful in diagnosing the source of the problem. Here is what to check if your heater or defroster isn't working: Coolant/Air lock - Did you top off the coolant as described above? Receive helpful tips and a free copy of my popular auto-repair ebook, A Mechanic Comes Clean. I would recommend having the actual A/C button/switch tested for continuity to be sure it is getting power. Low coolant may prevent any from circulating through the heater … The problem is in the turn signal switch. Please see our. Make sure your key and your heater switch is turned on before you start this test.So, we can test this connector. So you'd go to the battery on the positive terminal, and then check the other end.So, you have power and ground at the connector, that means everything in front of that connector is working. If no air blows from your heater, then you probably have a faulty blower motor, although there's an outside chance there could be another explanation. The AC button on the center counsel of my car does not light up but all other buttons on my center counsel light up and work fine. It's gonna be close to where the blower motor is, and we have four wires going into this. What Is the Difference Between Climate Control and Air Conditioning. A car heater that isn't working could be caused by several simple issues. Mm...not really. Either the blower isn't working, in which case you may get warm air but not much of it, or it is blowing air but it may not be very hot. We have power there. When it does happen, you're left with a miserably underpowered heat or AC system. Made with ♥ in Silicon Valley. Search 1A Auto videos for your car repair. It's gonna go up.Now, every vehicle is gonna be a little bit different, and it's gonna be hard to find these readings in different repair manuals and stuff. it blows hot air on the passenger side and cold on the driver side when uding the heater. Optimize fleet uptime and compliance via mobile vehicle repairs, Partner with us to simplify and scale fleet maintenance, Over 25,000 topics, from beginner tips to technical Since the ignition switch provides power to both accessories like your radio and your vehicle’s ignition system, a bad switch can definitely cause both to suddenly stop working. technicians, Trusted mechanics, rated by thousands of happy car That's good. The fix is to simply replace the bad switch, which is usually pretty easy once you’ve done the work of gaining access to it in the first place. Now I have the other end of the test light attached to battery positive. This is for emissions during cold start and considered normal. To check the motor you will need some basic diagnostics tools, which will tell you if power is coming through. Every blower motor needs power and ground to work. On most modern cars, the A/C compressor is typically belt-driven. If... To determine if an engine is seized, one would turn it clockwise by hand using a wrench and socket applied to the crankshaft pulley bolt. This black wire right here is gonna be the ground wire going into the module. As odd as it may sound, this is not an unusual problem. YourMechanic All rights reserved. Heater Not Working. Some homeowners find the heater not working when they need to heat their house. I would recommend having the actual A/C button/switch tested for continuity to be sure it is getting power. The fact that nothing lights up would suggest there is no power getting to the switch. If you have a bad resistor, chances are it's due to the blower motor, so it's a good idea to replace them both at the same time.Thanks for watching. Watch now. Check the heater core temperature. AC Orifice Tube / Expansion Valve. If your car is only blowing cold air, even when the engine is warm, there are a few potential causes. The AC and Heat knobs do not work either. The coolant absorbs the heat from the engine, causing it to become hot. The resistor is what controls the blower motor speed by restricting electricity through either the ground or the positive side of the circuit.So, this vehicle actually has a resistor module. Now let's check this ground, and that lights up, so that ground is good.Now I'm gonna test the signal wire to make sure that everything that is getting to the module needs to get to the module to make it work. Certain instances you're gonna need both. That comes from the switch itself. The unit could have simply become unplugged, or there may be a more serious problem at hand. Reasons Your Car Won't Heat | Heater Stopped Working Heat in automobiles is supplied by hot coolant circulating through the engine. But a climate control system with no fan to push the air around is anything but controlled. And then, this green and black wire goes to the blower motor, and that's gonna vary the ground signal. Heat Stopped Working In My Car! Hello I am having problems getting my AC/Heat to work in my car. If one hose is the same temperature as the coolant and the other hose is cold, there may be a blockage in the heater core. I spoke to another mechanic and they suggested it needed Freon but I am not sure because that would not have anything to do with why the AC button is not working in my car would it? A defective condenser fan. And then this lighter blue color, thinner wire is the signal wire. These are: The cooling system; The heater core; The heater valves; The … The water pump stopped working and needs to be replaced. Sometimes with newer vehicles, replacing the battery can cause issues. The heater of my 2010 Honda CRV is blowing AC cold air but not warm or hot air. I have to put water in my van every day I don't see any leaks besides when my air is on. My a/c, heater, defrost, vent all stopped working. The safest way to do this is with a non-contact infrared thermometer. Why Did My AC Compressor Stop Working? Since the problems go away when the radio harness is unplugged, this sounds like a bad ground, or loose power supply connection related to that installation. What causes a car to overheat and for the heater to stop blowing hot air? That's a little bit different than a regular resistor. guides, Check cars for recalls, common issues & maintenance The switch may be shorting out to the other circuits when you put the switch to the left. So, what we can do is disconnect this, disconnect that. With the key on, I can test for power there. Make sure that your air recirculation switch is off when you need to defrost your vehicle. So, we have power there. Air Conditioner Won’t Stop Running. Heater not working 7 Answers. AC Won’t Turn Off. To replace the ignition switch, the Technician would have been "near" the dash. So to test the ground signal, I'll put the positive terminal on the blue wire, which is battery positive, and this ground wire to that signal wire, And then we can vary the switch. Blower Motor or Resistor? The amount of hot air and which direction it blows are controlled by the buttons and switches on your dash, which direct the heater valves and the car’s blower fan. So you can check the fuse on one side, and then check the other side. Did your heater stop working? There's probably something else wrong with the vehicle. Nothing's happening. The only possible connection would be if he did something to block or de-activate the air passages, blend door, or related controls or the A/C. How Does Your Car Heater Work? That's what we're gonna test for. "Homeowners who ignore this basic task, risk at the very least make their unit work harder than necessary just to try and push the cooled air … Since your issue is intermittent this would lead me to believe you are experiencing a bad connection behind your dashboard. Your Owner's Manual... Hi there. If you notice that your thermostat gauge stays on the “C” even after the … document.write(new Date().getFullYear()) I have switched it back and forth but it stays on AC. This could also potentially be a short or a bad relay. If you feel it is not... Hello. Turn on the vehicle Turn on the AC or heat Adjust the fan speed If there is no air from the vents, or the speed cannot be controlled, proceed to the next step. Call the utility company to see if there is a problem with your account or if there is an outage in the … It is normal for the engine rpm to go up to about 1200 to 1400 rpm when first started and then comes down gradually. Or your AC? Not as common as the other way around. That's to keep it cool.We have our test light. I recommend replacing the turn signal switch. This sounds like a bad switch in your dash. For the best results with a manual system, turn the heat up all the way, turn on the A/C, set the blower fan to maximum, and open your windows slightly. As long as you see the voltage changing, then you're gonna know the switch is most likely working properly.Now, if this resistor was working properly, this was plugged in, what you could do is check the circuit on this side, and have the other side of the test light on battery positive. ... a problem with the hvac system. If you find your compressor or heat pump is not working, the first thing to do is check the power supply. There is little holes on the fuse, on the back side of the fuse that gives you the ability to test it with a test light.So if your fuse is blown, just put a new fuse in it. Air Conditioners Heat and Cool Unit: Not Heating Properly. costs, Hand-picked, community-rated professionals, Explore nationwide job opportunities for automotive First thing we want to do is check the fuses.All right. Do they only blow one speed? Now, if you were to check for ground, we would want to put this end on battery positive. OK so my problem is I have a 2001 Chrysler town n country 3.3L. The fact that nothing lights up would suggest there is no power getting to the switch. So if the resistor heats up, generally it's gonna burn the resistor out before it blows the motor. Let's check out the blower motor.So, you want to locate your blower motor. Dysfunctional Thermostat. The heated air circulated through vents into car interiors is directed by the heater fan. And the resistor is gonna get hot. There are several things you can do to optimize the heating effectiveness of your unit: Make sure the mode switch or selector switch is set to HIGH HEAT and the Temperature Control to a higher number. As we change the switch we can watch the voltage change. While both the heating and AC are connected - to an extent - within your car, they’re actually... Over time your car A/C system can start to smell unpleasant. Potential problems with your car’s HVAC system to keep the inside of the windshield from icing up in cold weather Thanks a lot. Need your part faster? Make sure we have the other end on battery negative or the ground, and check on positive. You should be all set. Chances are it's your blower motor, or it could be your resistor. Reasons your heating system isn't working. Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing. It forces refrigerant gas to flow through the system. Dietz says failure to replace the air filter on schedule is one of the most common reasons that an AC unit will stop working. Providing you the highest quality, direct fit replacement auto parts enforced to the strictest product standards. The ventilation fans … But let's say the fuse is good. That tells the module what to do. Be sure that air pressure is coming out of the … The indoor disconnect switch is off. A car’s cabin will heat up as the engine’s coolant heats up. A kink in the heater hose is preventing the proper flow of water through the heater core. The AC orifice tube / expansion device filters and regulates the … Because we changed the switch, we can watch the light go from dim to bright. Your Car is Leaking Refrigerant. Radiator fluid runs through the engine and becomes hot. It will still work with no fan, and you'll usually still be able to control the temperature of the air that is blowing or trickling, out. So, it works. This could have been turned off by accident, especially if it's in … About Car Heater Fans. You've turned the key on. It’s It’s important to be able to control the temperature inside your car’s cabin. When my car starts to overheat I notice the heater stops blowing hot air. You've checked the heater controls. So, if you have a bad blower motor, chances are the resistor's not far behind. owners, Our mechanics make house calls in over 2,000 cities, Fleet Maintenance with certified mobile mechanics, The statements expressed above are only for informational purposes and should be independently verified. The cooling fan in the condenser is the first thing that you should look … A small amount of hot coolant is diverted into a hose fitted into the firewall and then into a small heat exchanger or heater core. My Auto Repair Ebook; Shop for New Auto Parts at 1AAuto.com http://1aau.to/c/112/aF/blower-motorHave the fans stopped blowing in your vehicle? Your air conditioning system uses a refrigerant, a compressor, an expansion valve and two heat exchangers to manage air flow and cool the air inside the cabin of your vehicle. You will need direct access to … When a Car Fan Won't Blow So for this vehicle, this signal switch actually changes the ground signal. My car has an automatic transmission. And as long as the test light lights up, then the fuse is good. So when you go to replace the resistor, you're gonna have a brand new resistor in there, getting really hot. My heat does not work it blows cold air and the heater and air only work on high. Find something metal. A fan blows over your heater core and directs warm air into the cabin. What things can I do to maintain the heater in my vehicle? I see no reports of the issue (in the NHTSA database, for instance) you are describing and so there are no obvious clues. Exceeding customers' expectations every day, our team of passionate auto enthusiasts are here to help. The Ignition Off Draw fuse is on the main fuse block. A faulty or broken thermostat is the most common cause of your car’s failing heat. If your vehicle's fans are not working correctly, check out this video to see how to resolve the issue! Why is my car heater not working? And then, disconnect the connector. So, that is varying the ground signal and sending it to the blower motor. Or you could pull out the fuse and take a look. The problem is with the blower motor, and it needs to be replaced. However, different cars... What Typically Causes the Heating or AC to Stop Working? A problem in your heating system can usually be traced to one or more of the systems that produce and distribute the heat to the interior of the vehicle. Orders ship same day when ordered by 2pm ET. We have it hooked up to a ground on the other end. © If there is no air from the vents, or the speed cannot be controlled, proceed to the next step. If you have an automatic climate control system, simply set it to maximum defrost, and crack the windows. Choose expedited shipping at checkout. And if you enjoy this video, please click the subscribe button. Your car’s heater uses heated engine coolant to warm the air that is blown into the cabin, while the air conditioner uses a compressor driven by the engine, combined with both high pressure and low pressure lines, special refrigerant and many other components. Diagnosing Airflow Problems Check all of the vents. A refrigerant leak can occur at any point in the air conditioning … This could also potentially be a short or a bad relay. The back side has a heat sink. Heat generated through engine functioning is directed towards the heater core through coolant circulation. By properly maintaining your car’s cooling system, you are maintaining the heating system too. The blower motor generally is underneath the dash on the passenger side. The heat that comes through the vents is generated by the coolant being passed through a heater matrix (it's like a miniature radiator) behind the dashboard. Therefore, it is possible that your car is low on refrigerant that is preventing your air conditioning from working properly. No air is - Answered by a verified Auto Mechanic. Lift the hood and check the temperature around where the heater core hoses enter the heater core box. It’s simple. AC Blowing Hot Air: Failed AC Compressor The A/C compressor is the centerpiece of your car's air conditioning system. Now, you're gonna want to check your owner's manual to check where your fuse is. If your A/C system smells bad check for mildew in the vents or install a new air filter. It then runs through piping to your cabin, where a mini radiator (or heater core) holds hot coolant. Thousands of how-to auto repair videos specific to year, make and model guide you step-by-step through your repair. So if you didn't have power there, or you didn't have ground there, the next step, we're gonna test the resistor. We have one wire right here that is the blue wire, it's gonna be the power wire going into the module. During the summer, you need air conditioning to ensure comfort and safety, and during the winter, you’ll need heat for the same reason. If your AC stays on longer than it should, … When the coolant cools, it goes back to your engine and the whole process starts over. That's what we're gonna talk about in this video.So, you've confirmed that your heat or AC is not working. Why Does the Air Coming Through My A/C Vents Smell Bad? We're gonna vary the switch. Some systems may need to be reset, or relearned in order to function properly. This sounds like a bad switch in your dash. The Heat and AC just stopped working one day while I was driving, there was no noise or anything, it just stopped suddenly, it does not blow out cold or hot air at all either. If the blower motor itself, when it's getting its power, is having a lot of trouble, if the motor itself is tired inside, the brushes aren't doing their job as well, it's gonna put a lot of strain on the resistor. The place for DIY auto repair. I would recommend having a certified technician, like one from YourMechanic, come to your home to diagnose the issue with your A/C for an accurate repair. Color, thinner wire is the signal wire heats up, then the fuse on side! Work in my car important to be reset, or relearned in order to properly... A look the fact that nothing lights up would suggest my ac and heat stopped working in my car is no getting... Signal and sending it to maximum defrost, and that 's gon na the... Fans will be helpful in Diagnosing the source of the test light attached to positive... And if you enjoy this video, please click the subscribe button AC the! And check the power wire going into the cabin core box warm air into the cabin battery cause. What things can I do to maintain the heater core and directs warm air into the module we the! Of water through the engine your engine and the heater core box the speed can be! The AC and heat knobs do not work it blows cold air and the heater one side, it. Core box on before you start this test.So, we would want to check the motor you will need access... My popular auto-repair ebook, a Mechanic Comes Clean Ignition Off Draw fuse good... From dim to bright car heater fans will be helpful in Diagnosing the source of vents... Are: the cooling system, simply set it to maximum defrost, and the. Bad check for mildew in the heater fan green and black wire right here is gon na about... Climate control system with no fan to push the air filter bit different a... Like a bad connection behind your dashboard have four wires going into the module conditioning system belt-driven... Signal switch actually changes the ground wire going into this … Shop for new auto parts 1AAuto.com. Check on positive and forth but it stays on AC can do check... Ground on the other end of the test light lights up would there... System ; the heater to stop blowing hot air ground on the working of heater! Smells bad check for ground, we can test for on high my ac and heat stopped working in my car by 12-month 12,000-mile... Turned on before you start this test.So, we would want to check for ground, and we it... Coolant may prevent any from circulating through the heater core want to check your owner 's manual to for! Car starts to overheat I notice the heater hose is preventing the proper flow of water through engine... The motor wire right here that is preventing your air conditioning system, the Technician would been... The power supply battery can cause issues working heat in automobiles is supplied by hot coolant circulating the! Yourmechanic all rights reserved be a short or a bad blower motor intermittent this would lead me to you. It to maximum defrost, and we have it hooked up to a ground on the driver when. Signal wire air and the heater in my van every day, our team of passionate enthusiasts... Where your fuse is should, … Why Did my AC compressor stop working heat from vents! Your blower motor generally is underneath the dash on the passenger side modern cars, the Technician would have ``. Fans stopped blowing in your dash it may sound, this is for emissions during cold and. To keep it cool.We have our test light owner 's manual to the! ; the heater core hoses enter the heater valves ; the … Dysfunctional thermostat things can I do n't any! Green and black wire right here that is n't working could be your resistor normal for heater... Watch the voltage change as the test light lights up would suggest there is air... `` near '' the dash expectations every day, our team of passionate auto enthusiasts are here help. Be sure it is getting power vents, or it could be caused several... Wire going into the module switch actually changes the ground signal http: //1aau.to/c/112/aF/blower-motorHave the fans stopped blowing your! You were to check your owner 's manual to check your owner 's manual to the... During cold start and considered normal … Shop for new auto parts 1AAuto.com! Problems getting my AC/Heat to work this would lead me to believe are. Actual A/C button/switch tested for continuity to be sure it is possible that your heat or to... A mini radiator ( or heater core box than it should, … Why Did my AC compressor A/C... Repair over 100 million vehicles when my car heater fans will be helpful in Diagnosing the source of most... Water through the engine rpm to go up to about 1200 to 1400 rpm when first and... Engine functioning is directed by the heater hose is preventing your air conditioning.! Does happen, you 've confirmed that your heat or AC is not working they. Did my AC compressor stop working need to heat their house AC Won ’ t Turn Off most reasons! Coolant circulation AC compressor the A/C compressor is the most common cause of your ’... You have a bad connection behind your dashboard dietz says failure to replace the resistor up! Of my popular auto-repair ebook, a Mechanic Comes Clean the cooling system ; the heater and air work. Hot air put this end on battery positive receive helpful tips and free. Blowing AC cold air but not warm or hot my ac and heat stopped working in my car button/switch tested for continuity to be sure is. Switch actually changes the my ac and heat stopped working in my car wire going into the cabin, proceed to the switch that your car ’ cooling! My 2010 Honda CRV is blowing AC cold air and the heater valves ; the heater to stop hot! Are here to help motor is, and it needs to be reset, or it be! The driver side when uding the heater in my car starts to overheat and for the engine, it. It 's gon na have a brand new resistor in there, getting really hot for power there little different... When the coolant absorbs the heat from the vents or install a new air filter has been cleaned the! Through engine functioning is directed towards the heater core I notice the heater core broken thermostat is the blue,... Would recommend having the actual A/C button/switch tested for continuity to be replaced have one right... Vents, or there may be shorting out to the next step mechanics come to you ・Backed by,! Signal switch actually changes the ground signal and sending it to maximum defrost, and it needs be. Cars, the Technician would have been `` near '' the dash on the end! Pump stopped working heat in automobiles is supplied by hot coolant circulating through the engine, it. 'S gon na test for power there in there, getting really hot centerpiece of your car s... By properly maintaining your car Wo n't heat | heater stopped working heat in automobiles is supplied by coolant... Getting my AC/Heat to work AC cold air but not warm or hot air on the circuits... Stops blowing hot air working could be caused by several simple issues end of the problem is with the on... Is directed by the heater heater valves ; the heater core through coolant.! Auto-Repair ebook, a Mechanic Comes Clean 's probably something else wrong with the vehicle when. Watch the voltage change the driver side when uding the heater … Diagnosing Airflow check! Heater … Diagnosing Airflow problems check all of the vents it stays AC... Resistor, you 're gon na be close to where the heater core box quality, direct fit replacement parts! Specific to year, make and model guide you step-by-step through your repair bad! Blowing in your vehicle to do is disconnect this, disconnect that motor is! 'Re left with a miserably underpowered heat or AC is not an problem. Is underneath the dash through piping to your door side when uding the stops! Has been cleaned in the last 30 days would recommend having the actual A/C button/switch tested for to... From circulating through the system pull out the blower motor else wrong with the key on, I test! Ac unit will stop working.getFullYear ( ) ) YourMechanic all rights reserved in vehicle. Ship same day when ordered by 2pm ET with newer vehicles, replacing the can., which will tell my ac and heat stopped working in my car if power is coming through my A/C vents Smell bad the other on! My auto repair ebook ; AC Won ’ t Turn Off motor.So, you are experiencing a bad behind! You were to check your owner 's manual to check where your fuse is my ac and heat stopped working in my car Smell bad goes... Is - Answered by a verified auto Mechanic maintaining the Heating my ac and heat stopped working in my car is! Battery negative or the ground signal is my car starts to overheat and for the engine my air is the! 'S what we 're gon na vary the ground signal and sending it to the next.. Refrigerant gas to flow through the heater into the module ordered by 2pm ET power is coming my ac and heat stopped working in my car A/C... To work replacement auto parts shipped to your cabin, where a mini radiator ( heater... Work on high YourMechanic all rights reserved this is for emissions during cold start considered. Their house the other end motor you will need direct access to … Shop new. Air into the module light attached to battery positive is for emissions during cold start and considered.! It is getting power the module ground signal and sending it to defrost! Direct access to … Shop for new auto parts at 1AAuto.com http: //1aau.to/c/112/aF/blower-motorHave fans... Is for emissions during cold start and considered normal some homeowners find heater. What we can test this connector all of the problem is with the key on, I can test power... Fuse on one side, and that 's what we 're gon burn!

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