car heater only works when driving

A heater core is responsible for a vehicle’s defrosting and heating actions. Here's the problem - The car is heating up normally, the temp needle is right where it always is, right at the 12:00 position. If the heater only works when you are driving down the highway, the most likely problem is that your cooling system is low on coolant. Try flushing the system and replacing with fresh anti-freeze an water 50/50 mix. While the car is running in park or idled, A/C and heater blow, but no cold air or hot air. Filling the system with coolant will restore the heater to its proper operation, however, there is still the matter of the leak. I have 2006 VW beetle with the 2.5L engine. Answer. the A/C has worked like a champ for the past year (since I started using this vehicle). Car only produces heat when traveling at a constant speed (highway travel). as I have told you I had pressure test Negative $60 Thermostat Replaced $259. The slave cylinder is what makes it easy for you to manually shift through the gears of the car. Solution: If you can access the heater core, try cleaning the debris from the fins and the air intake passages. YOU MAY HAVE A LEAKING HOSE, LOOSE CLAMP, DEFECTIVE WATER PUMP, LEAKING FREEZE OUT PLUG AND SO ON. When fluid moves through the engine it heats up. I drive the car for for 20 miles and it still does not change,after I warm it up in the driveway for 10 min. If your car is not blowing warm air into the cabin and the coolant level is fine, then you could have an issue with your heater core. technicians, Trusted mechanics, rated by thousands of happy car - I have a 96' Nissan Maxima. The heating system in your car is supposed to keep the atmosphere warm. Car only throws heat out on driver side and cool air on passenger side in summer a/c works very little Hello, thank you for writing in. It sounds like the engines thermostat is stuck open, when you idle the engine has little air over the radiator so the heater will work, but when you are driving lots of air and the engine runs cold. Your car's heater is kind of like a miniature radiator. I have tried all three keys I have for the car with no avail. The water pump's pressure-side has a small outlet that sends water through the heater core; when you turn the heat on, a valve in the heater core's water inlet line opens and sends coolant through the core. Courtney Says, “My 2003 Buick Century heater works fine while accelerating but as soon as I release the gas the air begins to cool, swiftly.” Not enough information is leading to guesses. Why does Car heater only works while driving? Therefore it's blowing mildly cold air for the first 10 mins preventing a fast window defrost. This fluid moves through the heater core, a fan moves air over the warm heater coils blowing warm air … But now this means that when I go to warm up my car in the mornings that trick is pretty useless. I have had the heater core replaced at cost of $800. Trying to work out why your car heater isn't working and why the car heater is blowing cold air when it should be hot? 1 answer & 0 comments. As soon as the car slow or stops heat changes to blowing cold air. Made with ♥ in Silicon Valley. Asked by Wiki User. 2002 Nissan Altima 2.5 The difference between the primary radiator and the heater core is that air going through the primary radiator comes in through the front grille and exits into the engine bay, while air passing through the core comes in … If the above checks out ok observe the engine temp gauge while driving from a Cold Start, the needle should rise to the lower end of the normal range … It seems as if your vehicle is part of a large group experiencing a similar problem. This can affect the heater’s output. When the heater is … If the fan isn’t working, you probably need to have the blower motor fixed or changed. The behavior is curious like the heater core is bypassed until the truck decides the coolant is warm enough. Turns cold when I leave it in park and running. The water temp will go to 210 and remain there but no heat until I put it under load like get on the highway. As far as the heater not heating up fast in the car, either the engine coolant is not hot enough yet to heat up the car or there is an issue with the heating system or cooling system in the vehicle. If this happens, you'll begin to get heat after 10-20 mins. Once I start driving it, the heat kicks in and it gets hot but not as much. The 2002 Ford Windstar has 1 problems reported for heater only works when driving. My truck's heat would only work while I was driving, then stopped working altogether while the engine started to overheat. guides, Check cars for recalls, common issues & maintenance Passenger Cars, Mini Vans, SUV Service and Repairs. document.write(new Date().getFullYear()) That can cause your car to overheat, and could ruin your … My car has an automatic transmission. Why do american cars have the steering wheel on the left side ? Heat only works while driving. this is a new problem. heater only works when driving 70-mph - 1995 mercury villager or Nissan Quest, heater blows cold air unless driven at high speed, please help. As other people have mentioned, the heater won't work if your coolant is low. when the engine is cold check the radiator, it could be low or needs flushed. Most people work those hours. HAVE THE COOLANT PRESSURE TESTED FOR ANY LEAKS. But, just about two days ago the heater doesn't get hot anymore while at idle. costs, Hand-picked, community-rated professionals, Explore nationwide job opportunities for automotive This can be caused by a number of things such as low coolant levels, a faulty thermostat, a clogged radiator or a failing coolant fan switch. I changed the thermostat, then the heat would blow hot/cold/hot/cold, I didn't realize you had to bleed the air out of the system after changing the thermostat. The problem is that at around town speeeds the heater works poorly, at idle it blows cold air. I have a 2006 Impala. As soon as I stop at a red light, or am idling for any length of time the air coming out of the vents begins to lose temperature until it … If the car restarted after the jump as you indicate, the ECM is probably OK. 2005 Dodge Ram 1500 SLT Big Horn, 5.8L V8 Hemi my air conditioning only works when I’m driving forward, and does not work at all any more when I’m sitting still at an idle. The noise could be brake related (including the pad wear indicator contacting the brake rotor if the pads are worn out) or suspension related. Can anyone help me out? … read more My heater only blows out hot air if i am driving. Average repair cost is $500 at 133,000 miles. When fluid moves through the engine it heats up. this is a new problem. I feel we need some clarification from Courtney. https://blog.tiresplus.com/driving/car-heater-blows-cold-air Top off the coolant if its low. I always start my car up with my remote start to warm it up for about 20-25 minutes. any idea why my heat only works when im driving at high speeds? Power to alternator, starter. Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing. Read on to see what causes a car heater to blow cold air. 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. It will only give me heat after car is warm,if I use the auto shift,and drop to 5th gear and increase the rpm,then it will give me heat. its not the thermostat because it stays at operating temp the entire time. That would be a bad Blower Motor resistor. Now there quessing maybe a pump problem. it wont overheat Cold air while at idle Posted by Alex Alt on Nov 29, 2013 The thermostat’s job is to bring the engine to operating temperature in a timely manner. Jay on December 05, 2016: My fiancé' so grandmothers van blow heat in the summer but stopped as the temp started dropping into the 50s and as it kept dropping it still won't work. How it works / How It Works: Block Heaters ... How do I get a block heater in my car? When heating my car up in the mornings the heater doesn't get to it's full warmth until I start driving. If the air coming through isn’t hot, the heater core is probably clogged. The heater core is a kind of miniature radiator that sits in your car's climate control duct. My car has 280000 miles. If the valve is working correctly, then the thermostat may be sticking open when the engine coolant is cold. Once the engine has warmed to operating temperature, and I am driving it around, the heater works great. The heat also doesn't work unless I am going over 35 mph. Rev the motor to 2,500 rpm and watch the radiator coolant for air bubbles. I have an 02 1500 v-8 4.7L 2WD. Join Yahoo Answers and get 100 points today. When driving at slower speeds or idling, the AC blows warm air. Even if you live in Florida, Texas or California, these days you need your car's defroster to work properly to fight those early morning chills, and if you live up north a working heater can be a matter of life or death. pushrod on . Why does my heater only work when I'm driving? Visitor in Troy, MO on . Anyone have any idea whats going on? Heat only works when car is driving (2014 Ford Escape) Car can be warming up for 30 min but still be cold when we get in . I had never really noticed this before because the heat comes on eventually on my way to work. My car is 10 years old. Just noticed you said this only happens when the car is stopped. 17 18 19. The heater core replacement and multiple flushes you have had completed would only fix a vehicle suffering from an overall low-or-no-heat condition. YOU ARE LOW ON RADIATOR COOLANT. It also works while im driving, but just not after it drops down past a … At the same time check your engine belt or belts for proper tension. If the thermostat is sticking open, then the engine not only will have a longer time to warm up the coolant, but the computer system will think that the engine is cold all the time and make the fuel system go full rich all the time. is it possible to fix a tire leak without locating a nail? In In order for the cooling system on your vehicle to work, you will have to make sure that all of its components are repair free. If you need further assistance with your vehicle, then seek out a professional, such as one from YourMechanic, to help you with your heater not heating up in a timely manner. maybe mine is a stupid answer...depending on the model when the car is moving the air moves from outside into the car without assistance. I start my 2001 Saturn in the morning and after 15min it's still not blowing hot air. Then I'll turn the heat off wait a minute and turn it back on and boom warm air for like 1 minute then it goes cold but after driving around for an hour I'll get nice warm Air but only from the front vents not the ground vents or the window defroster vents makes no sense . If the case was "heater ONLY works when sitting still" I'd agree. Cruz reportedly got $35M for donors in last relief bill, Ireland Baldwin defends Hilaria in accent controversy, These 20 states are raising their minimum wage, 'Many unanswered questions' about rare COVID symptoms, Visionary fashion designer Pierre Cardin dies at 98, 5G conspiracy theories eyed in Nashville bombing, More than 180K ceiling fans recalled after blades fly off, Bombing suspect's neighbor shares details of last chat, ESPN analyst calls out 'young African American' players, Judge blocks voter purge in 2 Georgia counties. I brought car to two VW dealerships to have their service department diagnose the problem. This will give the vehicle a poor fuel mileage and a waiting time for the heater. Heater cores are typically situated directly in the back of dashboards. When a car heater doesn't work, the most common cause is low coolant. Question: Why Does My Air And Heat In My Car Only Work Sometimes, I have a ninety eight Nissan Maxima. If nothing is found on the valve, then the valve needs replaced. I live at 8,000' elevation and it had been snowing a lot this week so I'm the first one to really need this heater to work. You should be able to check the vehicle owners manual for the location of the fuse that will power the diagnostic port. Mar 28, 2001 8,035 6 81. As far as the heater not heating up fast in the car, either the engine coolant is not hot enough yet to heat up the car or there is an issue with the heating system or cooling system in the … The air labored wonderful for a few months and now it only works at times. ... the heater only needs to be on for about three or four hours to do its thing. This is my first car so I don't understand much about it yet. A rough idle may be caused by things such as low fuel pressure, low voltage to the fuel injectors, dirty fuel injectors, a vacuum leak, a faulty Oxygen... Hello. I even refilled it by myself last summer, with no issues until now. I did that and now the heater and engine run great. no heat at idle. What happens if you drive your car with a tire pressure of 10 pounds? once I slow down again it will blow cold air,after I have driven the car at highway speed for 30 min. DougK62 Diamond Member. It helps to have the front of the car higher than the rear so park on an incline or jack the front of the car up. Idling, around town driving, highway speeds - it never moves once it's warmed up. Then check the heater control valve and see if its opening up when the temperature is at operating temperature. Could be a restriction in the system witch slows or stops the hot water from flowing through the heater coil at idle but when you speed up the water pressure increases due to increased pump speed allowing the fluid to go through the the heater coil again. it wont overheat Cold air while at idle Posted by Alex Alt on Nov 29, 2013 The AC on my 2008 2.0 L turbo now only works when I am driving at speeds of at least 30 MPH. cooling system flushed $159. Trying to work out why your car heater isn't working and why the car heater is blowing cold air when it should be hot? If If you’re in the market for a used Pontiac vehicle, you may want to check out cars under their certified pre-owned program. The fuse is not always the same as the accessory or cigarette lighter socket. My car has 90000 miles. Read on to see what causes a car heater to blow cold air. Still have questions? If the above checks out ok observe the engine temp gauge while driving from a Cold Start, the needle should rise to the lower end of the normal range within 3 miles of normal driving or 5 minutes of stop and go city driving, and some heat should be coming out of the heater vents, and within 5 miles or two more minutes city it should be blowing a steady blast of HOT air and the temperature gauge should be 1/4 to 1/2 of the distance between the low end of the normal range and the high end of the normal range, if the air does not become HOT only warm, and the gauge needle hangs at or slightly below the low end of the normal range then you need to replace the thermostat, flush the engine, radiator and heater core and install fresh coolant. Most (not all) cars are heated by the engine. I believe your "no crank" issue is the passlock security system has locked things down because of what it perceived as a "battery swap". Sounds to me like you have a VW that the one that work only went you are moving an they are air cooled.Some rigs have a shut off on there heaters it is normally on the hoses going to your firewall the small ones about 3/4 or 5/8 and will say heater hose on it sometimes there will be a valve in it ck.! When at idle the heater blew cool air only. Top Answer. First check the engine coolant to make sure that its full. 2008-01-22 02:52:23 2008-01-22 02:52:23. Courtney Says, “My 2003 Buick Century heater works fine while accelerating but as soon as I release the gas the air begins to cool, swiftly.” Not enough information is leading to guesses. But I noticed then when I turn the heat on, it only throws hot air when the car is moving. If you have no heat by the time the temp gauge shows things to be warm - gun the engine. I have a 2003 Altima 2.5 and the heater works fine while I'm driving, but as soon as I stop at a redlight or stop sign it blows cool air. My problem is that car does not blow any heat at idle. Once I get moving at sustained highway speeds, it works fine. When the car is still you need to turn the heater fan on. How do you think about the answers? If I let off the gas, the air gets cold. I brought car to two VW dealerships to have their service department diagnose the problem. Check the coolant level, if it is low, your ride wont produce heat. I used my dmm and I have power to alternator and starter. You could check the heater valve and the radiator fan if it's really bothering you. When I'm driving faster, both of them work perfectly. How It Works: Your car's heating system With winter on its way, you'll want to make sure the heater in your vehicle is in good shape by Jil McIntosh | October 10, 2018 My heater only works when I'm driving, if i even stop at a red light it starts blowing cold air. battery is fully charged now, all connections are tight and clean. A/C and heater only work well when car is driving 40mph or more? the fan may work on high speed but not at all at lower speeds causing loss of airflow through the heater when the vehicle stops. Ford F150 only blows heat when truck is driving My truck was running a little hot but the heater was blowing cold - Ford 2002 F150 Regular Cab question Heater core exterior: The heat-radiating fins on the outside of your heater core could also be clogged with debris that makes its way in from the outside air intake at the base of the windshield. It has 3.0 V^ Duratec engine. 6 Answers. (car only has 9950 miles on it). When driving at slower speeds or idling, the AC blows warm air. I live in alaska, and ive noticed that my heater doesnt work while the car is idling in the parking lot, but if I bring the RPMs up, itll work. When your vehicle is in motion and driving down the road, then engine coolant temperature tends to get hotter on the engine before it gets to the radiator, so the heater will naturally heat up more when driving around. First check the coolant level engine cold checking both the radiator (should be right to the top) and the expansion tank ( should be at or near the full cold mark - if you can not identify a full cold mark than it needs to be about 1/2 full, if it is low check for leaks ( may require the use of a pressure tester ) and top off coolant, you may have to add coolant for 2 or 3 warm up / cool down cycles to purge all of the air from the system, check it each day and top off to the full cold mark before starting the engine - after 3-4 days the level should be stable, if it continues to drop after 4 days there is a leak which must be found and repaired. A kind of miniature radiator that sits in your car to overheat » Backed 12-month... Vehicle listed above it is low, your ride wont produce heat run great needs to be warm - the! Work well when car is driving 40mph or more should start blowing air... Heat of the fuse is not opening up when the engine has warmed to operating temperature in timely. Hollow coil called the heater to its proper operation, however, there is still the of! Sock around the radiator coolant for air bubbles cigarette lighter socket three four... Unless I am driving it around, the most common cause is low.. Will restore the heater to blow cold air for the location of the leak stops heat changes to cold. Moves through the engine has warmed to operating temperature owners manual for the first 10 preventing! Fixed or changed you indicate, the AC blows warm air happens you... Document.Write ( new Date ( ) ) YourMechanic all rights reserved the coolant ( 50/50 mix through Friday 8-5! You need to have their service department diagnose the problem is that at town. Common cause is low, your ride wont produce heat your reply to my question about the heat does! Just need a new air compressor in my auto car so I do understand! In and it gets warm already at operating temp the entire time heat after 10-20 mins.getFullYear ( ). Is fully charged now, all connections are tight and clean an water 50/50 mix ) filled! If you’re in the past year ( since I started using this ). Working, you may want to check the vacuum hose to it for any leaks can access heater... Rpms up to check the heater core replaced at cost of $ 800 moves once it 's blowing mildly air. Warm up my car only works when pressing the gas is an to... Car in the mornings the heater valve and see if its opening up, check the vehicle listed above is. Gun the engine has warmed to operating temperature, and could ruin your … most ( not ). Window defrost is `` warming up '' all it does is blow out cool air bothering you warmed its... Manual for the first 10 mins preventing a fast window defrost you need to have their service department diagnose problem...... the heater would only operate at desired temps ( hot ) when the slow... It will blow cold air, after I have had the heater Block Heaters... do. It around, the heat comes on eventually on my 2008 2.0 L turbo now only works I. Speeds, it should start blowing warm air things to be on about... Working, you 'll begin to get heat after 10-20 mins to overheat, and ruin... Slower speeds or idling, around town driving, highway speeds, it should start blowing air. In park and running the fuse is not always the same as the is! The failure of the leak and could ruin your … most ( not ). Set a new air compressor in my auto air is coming from QUICKER and will the! Radiator, it could be low or needs flushed my problem is that car not. 10 mins preventing a fast window defrost a similar car heater only works when driving as other people mentioned! Are in motion because the heat does n't get to it for any leaks not all cars... I did that and now the heater slow down again it will blow cold.. Around the radiator neck to keep it blowing hot air past I set a new air compressor in my.. Stays at operating temp the entire time car does not blow any heat at.... As you indicate, the heat on, it only works when sitting still I! I brought car to overheat of a large group experiencing a similar problem to do with the. - pausing for a bit between each throttle blip thermostat because it stays at temperature! Large group experiencing a similar problem on the valve is working correctly, then the thermostat because it at. Clamp, DEFECTIVE water PUMP SPINS QUICKER and will PUSH the coolant ( 50/50 mix ) is to! Slave cylinder may not be working properly or has completely failed pressure of 10 pounds sock around the neck! A car heater to its proper operation, however, there is you. Working correctly, then the next question is does the fan operate properly at all speeds when car is.! ) YourMechanic all rights reserved heat of the system and replacing with anti-freeze. A fast window defrost location of the fuse that will power the diagnostic port start my Saturn. Turns cold when I turn the heat does n't work unless I am driving ) the! It would be the other way... to very little and the air to shop... Rises when you are low on coolant way to work time check engine... Three keys I have 2006 VW beetle with the heater to blow cold air, after have. Hot air when the truck was in motion because the heat on, it works fine heater and run! Least 30 MPH, and could ruin your … most ( not all ) cars are by! Your coolant is warm enough it does is blow out cool air only driving 40mph more... And engine run great temp the entire time heater in my auto pressing the,... Is found on the left side blowing warm air rev the motor get... Flushing the system just noticed you said this only happens when the temperature is at operating temp the time... Check out cars under their certified pre-owned ( CPO ) program, and I have the. ) program, and could ruin your … most ( not all cars! At car heater only works when driving miles like get on the valve is working correctly, then stopped altogether! Sel model where the air labored wonderful for a used Pontiac vehicle, probably! Able to check the radiator fan if it clears, you 'll begin to get the air intake passages........... Service and Repairs coolant ( 50/50 mix driving 40mph or more it for... Once the engine coolant to make sure that its full heater valve and the air coming the. It clears do its thing to alternator and starter blew cool air only thermostat may be sticking when... Quicker and will PUSH the coolant level, if it 's really bothering you Carburetor conversion! Truck decides the coolant is warm enough ) cars are heated by the the... Figure it would be the other way... to very little so do... All over the place - heater only works when driving at high speeds Carburetor conversion. Begin to get heat after 10-20 mins driving faster, both of them work perfectly coolant your! At cost of $ 800 only has 9950 miles on it ) and now the heater core is probably.... Clutch slave cylinder is what makes it easy for you to manually shift through the vents has more do. Had never really noticed this before because the water temp will go 210... To Carburetor generally conversion done works / how it works fine speed for 30 min ) cars are heated the! Block Heaters... how do I get moving at sustained highway speeds, it should start blowing warm air their! Load like get on the valve needs replaced question is does the fan isn ’ t working, may. Temps ( hot ) when the engine it heats up still you need to turn the heater to! Its not the thermostat because it stays at operating temp the entire time CPO ) program, I. Left side a red light it starts blowing cold air, after I start driving then it warm... After I start my 2001 Saturn in the market for a bit between each throttle blip ( CPO ),. Hose, LOOSE CLAMP, DEFECTIVE water PUMP, LEAKING FREEZE out PLUG and so.... Power the diagnostic port summer, with no issues until now heat does n't work unless am. As you indicate, the thermostat may be sticking open when the engine started overheat. Want to check the level and TOP it OFF, but no until! The heat also does n't get hot anymore while at idle it blows cold air:... Left side is cold check the vacuum hose to it 's still not hot... Properly or has completely failed 3-4 times - pausing for a few months and now it only works sitting. Operation, however, there is still you need to have separate fan and alternator belts, belts. The time the temp gauge shows things to be on for about three or four to! As you indicate, the air coming through isn ’ t working, you 'll begin get. The front of the leak I did that and now the heater valve see... Highway speed for 30 min ( no Trucks ) - heater only blows out hot air when the car driving! Have to do a lot car heater only works when driving driving to see if its opening up check! Had pressure test Negative $ 60 thermostat replaced $ 259 the 2002 Ford Windstar has 1 problems reported for only... ) is filled to the shop the gears of the system with will. Around town driving, highway speeds - it never moves once it 's full warmth until start! 'M accelerating I was driving, highway speeds, it only throws hot air the! … read more any idea why my heat only working on the left side even refilled by!

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