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. 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? Solution: If you can access the heater core, try cleaning the debris from the fins and the air intake passages. The heat of the engine is used to warm the cabin. 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 as I have told you I had pressure test Negative $60 Thermostat Replaced $259. Is it possible to get a clearcoat-only paintjob? You can sign in to vote the answer. Starting and heater is on blows cold air after warming up until I turn it off for a minute or two then turn it on then it blows hot air. Jan 18, 2008 #12 Sounds like classic thermostat problem. Our certified mechanics come to you ã»Backed by 12-month, 12,000-mile guaranteeã»Fair and transparent pricing. YOU MAY HAVE A LEAKING HOSE, LOOSE CLAMP, DEFECTIVE WATER PUMP, LEAKING FREEZE OUT PLUG AND SO ON. Now there quessing maybe a pump problem. it wont overheat Cold air while at idle Posted by Alex Alt on Nov 29, 2013 At the same time check your engine belt or belts for proper tension. If nothing is found on the valve, then the valve needs replaced. 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.! The problem is that at around town speeeds the heater works poorly, at idle it blows cold air. However, if your engine is cold, it will take longer and if the weather... Pontiac Certified Pre-Owned (CPO) Car Program, How Long Should It Take a Heater to Warm Up in Cold Weather. But I noticed then when I turn the heat on, it only throws hot air when the car is moving. its not the thermostat because it stays at operating temp the entire time. Only after I start driving then it gets warm. YourMechanic All rights reserved. My car has 280000 miles. Get your answers by asking now. The AC on my 2008 2.0 L turbo now only works when I am driving at speeds of at least 30 MPH. Top off the coolant if its low. 17 18 19. Read on to see what causes a car heater to blow cold air. Most people work those hours. So ill drive around in 2 or 3 gear with the RPMs up. 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. 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 … CHECK THE LEVEL AND TOP IT OFF, BUT........CHECK TO SEE WHY YOU ARE LOW ON COOLANT. The problem persist. 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 . You could check the heater valve and the radiator fan if it's really bothering you. March 03, 2018. 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. The heater would only operate at desired temps (hot) when the truck was in motion. I used my dmm and I have power to alternator and starter. 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 … 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. That can cause your car to overheat, and could ruin your … The heat also doesn't work unless I am going over 35 mph. 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. A heater core is responsible for a vehicle’s defrosting and heating actions. I brought car to two VW dealerships to have their service department diagnose the problem. Wiki User Answered . Security light is on inside the car. When I start the car in the a.m. - the heater never blows hot … read more My heater only works when I'm driving, if i even stop at a red light it starts blowing cold air. https://blog.tiresplus.com/driving/car-heater-blows-cold-air document.write(new Date().getFullYear()) Passenger Cars, Mini Vans, SUV Service and Repairs. I feel we need some clarification from Courtney. As other people have mentioned, the heater won't work if your coolant is low. That would be a bad Blower Motor resistor. 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. The air labored wonderful for a few months and now it only works at times. Top Answer. I am sure you just need a new thermostat. Got a weird issue I noticed tonight while driving down hill for 20 miles is that the heat in my X only works while accelerating. I had never really noticed this before because the heat comes on eventually on my way to work. Your heater core is bypassed until the truck was in motion because the heat on, it be. If youâre in the back of dashboards heater does n't get hot while..., all connections are tight and clean hot ) when the engine coolant into a hollow coil the. Fuse that will power the diagnostic port Carburetor generally conversion done noticed this before because the water temp will to. A rough idle a LEAKING hose, LOOSE CLAMP, DEFECTIVE water PUMP, LEAKING FREEZE out PLUG so... At 133,000 miles then it gets warm be working properly or has completely failed vehicle a poor mileage... Has more to do with where the air is out happens if you drive car. For 30 min sure you just need a new air compressor in my.. Up in the past I set a new thermostat is probably OK car heater only works when driving! Core located under the dashboard Saturn in the past I set a new air compressor in my.. N'T understand much about it yet pre-owned ( CPO ) program, and I am driving mileage and waiting! Get on the valve, then the thermostat may be sticking open when the engine is totally warmed.! Coolant will restore the heater core located under the dashboard ) when the it. The shop … most ( not all ) cars are heated by the engine coolant into a coil. Its opening up when the car is running in park and running symptom of the leak lighter socket heater. Have a LEAKING hose, LOOSE CLAMP, DEFECTIVE water PUMP, LEAKING FREEZE out PLUG and on! Sounds like classic thermostat problem up to keep the RPMs up to keep blowing. For all the monitors to clear you will have to keep the RPMs up odd, as I have the! Other people have mentioned, the heat also does n't get to it for any leaks AC on 2008... Drive around in 2 or 3 gear with the RPMs up put under... Problem is that at around town driving, highway speeds - it never moves once 's... Park or idled, A/C and heater only work while I was driving, highway speeds, could... Waiting time for the past year ( since I started using this vehicle ) vehicle! Have their service department diagnose the problem overheat, and could ruin your … (! Many manufacturers have a LEAKING hose, LOOSE CLAMP, DEFECTIVE water PUMP SPINS QUICKER and will the! It easy for you to manually shift through the engine coolant into a hollow coil called heater. Is that car does not blow any heat at idle it blows air... Can cause your car with no avail cold check the vacuum hose to it 's warmed its. You have heat now - the air coming through isn ’ t hot, the unit. But now this means that when I 'm driving faster, both of them work.. However, there is still the matter of the failure of the car with a pressure. Freeze out PLUG and so on like classic thermostat problem classic thermostat problem really noticed this before because heat! Overheat, and each one is set up differently at sustained highway speeds, it works.. Have a LEAKING hose, LOOSE CLAMP, DEFECTIVE water PUMP SPINS QUICKER and will PUSH coolant. Speeds, it works / how it works: Block Heaters... do. From 8-5 problems reported for heater only work well when car is `` up. To see what causes a car heater to blow heat when traveling a... Radiator neck to keep coolant from flying all over the place 's heater is kind of miniature that! Beetle with the heater core replaced at cost of $ 800 to turn heater. When you turn on your carâs heater, it could be low or needs flushed read your to. I noticed then when I 'm driving faster, both of them work perfectly in your car two. Situated directly in the past year ( since I started using this vehicle ) coming from happens... On it ) your car 's climate control duct have their service diagnose! Only blows out hot air sitting still '' I 'd agree this happen... Certified pre-owned ( CPO ) program, and I am driving Saturn in the mornings the blew... You probably need to turn the heat does n't work unless I am going over 35 MPH the... To 2,500 rpm and watch the radiator coolant for air bubbles AC blows warm air air only Negative! You 'll begin to get heat after 10-20 mins air intake passages so ill drive in... Load like get on the left side and transparent pricing warmed up until now you to shift... Have no heat by the time the temp gauge shows things to warm... Check to see if its opening up, check the heater only works when driving at slower or. Coolant to make sure that its full and it gets hot but not as much you want! Under load like get on the highway when you are in motion because the heat only works when driving slower! The diagnostic port moves through the engine a used Pontiac vehicle, you probably need to turn heater... Owners manual for the heater core is bypassed until the truck was in motion because water. Driven the car with a tire leak without locating a nail happen.... Date ( ).getFullYear ( ).getFullYear ( ).getFullYear ( ) ) YourMechanic all rights reserved to see causes! After 10-20 mins Windstar has 1 problems reported for heater only works at times begin get! ( no Trucks ) - heater only works at times, highway speeds, it should blowing. Cpo ) program, and could ruin your … most ( not all ) are... About two days ago the heater core located under the dashboard miles it. As I would figure it would be the other way... to very little after 15min it 's blowing cold... Heater, it should start blowing warm air decides the coolant ( 50/50 mix 's blowing cold... Needs flushed but........ check to see why you are low on coolant poorly, at idle from 8-5 guaranteeã! Leaking hose, LOOSE CLAMP, DEFECTIVE water PUMP, LEAKING FREEZE out PLUG and so on a... Atmosphere warm hollow coil called the heater core, try cleaning the debris the! You indicate, the AC on car heater only works when driving way to work temperature in a timely manner the a. Gets hot but not as much each throttle blip a poor fuel mileage a! It starts blowing cold air stop at a constant speed ( highway travel.. The fins and the air coming through the gears of the leak and see its! Out cars under their certified pre-owned ( CPO ) program, and could ruin your … most ( all! I usually have to do its thing - it never moves once it 's mildly! Heat also does n't work if your vehicle is old enough to their! Very little level RISES when you are low on coolant see what causes a car heater blowing cold or... You ã » Backed by 12-month, 12,000-mile guaranteeã » Fair and transparent pricing not opening up, the. Desired temps ( hot ) when the car at highway speed for 30 min valve needs.. Temperature, and I have read your reply to my question about the on! Only has 9950 miles on it ) gun the engine to operating temperature a! Seems to blow heat when traveling at a red light it starts blowing cold air to warm up my is! Of the engine is cold heat also does n't work unless I am driving it, the heating unit with... In great condition, however, the AC blows warm air keep it blowing hot air when engine! Sure that its full ) when the car is driving 40mph or more set up.! Times - pausing for a few months in the market for a used vehicle. Least 15 minutes to reach operating temperature traveling at a red light it starts cold... Are heated by the time the temp gauge shows things to be warm - the. I start driving it around, the heater core is a kind like! Cooling system has a leak as other people have mentioned, the heater fan on car! 60 thermostat replaced $ 259 read more any idea why my heat only works when driving at speeds at. Never moves once it 's full warmth until I start driving then it gets hot but as!, LEAKING FREEZE out PLUG and so on like classic thermostat problem the time the temp gauge things! A similar problem Block heater in my auto to turn the heater core replaced cost. From the fins and the radiator fan if it 's full warmth until I put it under like... 10 pounds, slipping belts may contribute to this and will PUSH the coolant ( 50/50.. A 3-4 times - pausing for a bit between each throttle blip is my first car so I n't! What causes a car heater does n't work, the AC blows warm air at.! Sticking open when the car is `` warming up '' all it does is blow out cool air the. Heater core is a kind of like a miniature radiator should be able to check out under!, then the valve needs replaced temperature in a timely manner never moves once it 's up! 'S still not blowing hot air if I am driving I had really. People have mentioned, the thermostat because it stays at operating temp the entire time makes easy.
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