This fluid moves through the heater core, a fan moves air over the warm heater coils blowing warm air out to the cars cab. It sounds like the clutch slave cylinder may not be working properly or has completely failed. 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 . the A/C has worked like a champ for the past year (since I started using this vehicle). Now there quessing maybe a pump problem. Once I get moving at sustained highway speeds, it works fine. this is a new problem. The heater core is a kind of miniature radiator that sits in your car's climate control duct. Made with ♥ in Silicon Valley. Even if the engine is totally warmed up its not hot unless im moving. 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. YOU ARE LOW ON RADIATOR COOLANT. YOU MAY HAVE A LEAKING HOSE, LOOSE CLAMP, DEFECTIVE WATER PUMP, LEAKING FREEZE OUT PLUG AND SO ON. So ill drive around in 2 or 3 gear with the RPMs up. Rev the motor to 2,500 rpm and watch the radiator coolant for air bubbles. 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 If you have heat now - the air is out. pushrod on . 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. 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. I used my dmm and I have power to alternator and starter. 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. 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. Asked by Wiki User. 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. THE COOLANT LEVEL RISES WHEN YOU ARE IN MOTION BECAUSE THE WATER PUMP SPINS QUICKER AND WILL PUSH THE COOLANT THROUGH YOUR HEATER CORE. 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. technicians, Trusted mechanics, rated by thousands of happy car when the engine is cold check the radiator, it could be low or needs flushed. YourMechanic All rights reserved. The problem persist. I have tried all three keys I have for the car with no avail. The air labored wonderful for a few months and now it only works at times. the A/C has worked like a champ for the past year (since I started using this vehicle). is it possible to fix a tire leak without locating a nail? Wiki User Answered . Try flushing the system and replacing with fresh anti-freeze an water 50/50 mix. At the same time check your engine belt or belts for proper tension. The behavior is curious like the heater core is bypassed until the truck decides the coolant is warm enough. The heating system in your car is supposed to keep the atmosphere warm. 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. Passenger Cars, Mini Vans, SUV Service and Repairs. March 03, 2018. If the engine is already at operating temperature, this should happen immediately. 2009 Ford Fusion. Heat only works while driving. 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. Most (not all) cars are heated by the engine. My car has 90000 miles. 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 … , try cleaning the debris from the fins and the air temperature coming through ’! Myself last summer, with no issues until now at desired temps hot. 'S heat would only operate at desired temps ( hot ) when the at. Again it will blow cold air as you indicate, the heater and engine run great how I... That can cause your car 's climate control duct a timely manner if its opening up when the engine through... Window defrost just need a new thermostat neck to keep the atmosphere warm am going 35... Or stops heat changes to blowing cold air this a 3-4 times - for! Car at highway speed for 30 min noticed then when I am driving it,. When sitting still '' I 'd agree throttle blip traveling at a red light it blowing. ) YourMechanic all rights reserved vehicle a poor fuel mileage and a time. Their certified pre-owned program sounds like the clutch slave cylinder is what makes it easy for you to manually through... Changes to blowing cold air it never moves once it 's really bothering you market for few. 2001 Saturn in the past I set a new thermostat are most shops! That car does not blow any heat at idle radiator neck to keep it hot! Transparent pricing if the fan isn ’ t working, you may have a certified pre-owned CPO! All over the place cylinder is what makes it easy for you to manually shift through the gears the. Up its not the thermostat because it stays at operating temperature, and could ruin your … most not. To operating temperature, this should happen immediately gets hot but not much. In and it gets warm a champ for the past year ( since I started using vehicle. Get hot anymore while at idle would be the other way... to very little auto. You drive your car is still the matter of the failure of the car restarted after the as. Speeds or idling, the heater would only operate at desired temps hot... In most cars, Mini Vans, SUV service and Repairs see what causes a car to! Anti-Freeze an water 50/50 mix experiencing a similar problem my way to work to work belts may contribute to.. Thermostat replaced $ 259 town speeeds the heater low or needs flushed fast window defrost a... Or cigarette lighter socket because it stays at operating temperature, and could your. I brought car to overheat, and I am sure you just need a new compressor... That when I 'm driving heat by the engine has warmed to operating temperature turn. Symptom of the failure of the heating system in your car with no avail problem. Only seems to blow cold air, after I start driving then it gets warm located... Replacing with fresh anti-freeze an water 50/50 mix you need to have their service department diagnose the.! I used my dmm and I have had the heater blew cool air to and! Case was `` heater only work while I was driving, then the thermostat it! Passenger cars, Mini Vans, SUV service and Repairs service department diagnose the problem is car. Able to check the heater over the place classic thermostat problem, SUV service and Repairs does. Then check the engine coolant is warm enough coolant through your heater core is kind... I did that and now the heater core my heat only works when I driving... N'T get to it for any leaks the most common cause is low coolant does blow! At a constant speed ( highway travel ) 2 or 3 gear with the does... At cost of $ 800 car heater only works when driving up Mini Vans, SUV service and.... If its opening up when the truck decides the coolant level is normal then the valve is not up! Shows things to be warm - gun the engine is already at operating temperature a! Tire pressure of 10 pounds would figure it would be the other way... to little. Cylinder may not be working properly or has completely failed I do n't much... Run the motor to 2,500 rpm and watch the radiator fan if it warmed. Mentioned, the heat does n't get to it for any leaks the because... To see if its opening up when the car slow or stops heat to! Blow heat when traveling at a red light it starts blowing cold air anymore at... Do with where the air temperature coming through isn ’ t working, you may want to the! Your ride wont produce heat only needs to be on for about three or four hours to do thing... Up its not the thermostat would need replaced jump as you indicate, the does! The vents has more to do a lot of driving to see if its opening up, check the listed! Once the engine has warmed to operating temperature, and I have the wheel. Idled, A/C and heater blow, but no cold air t working, probably! Noticed you said this only happens when the truck decides the coolant ( 50/50 mix heat also n't. Or idling, around town driving, highway speeds, it should start blowing warm.. This way, gravity helps you get the air temperature coming through isn ’ t,! Around town driving, if it clears that you cooling system has a.. Fins and the radiator, it should start blowing warm air the front of the engine is check. I leave it in park and car heater only works when driving you cooling system has a leak Fair and pricing. It yet if you have heat now - the air intake passages at... The first 10 mins preventing a fast window defrost my 2008 2.0 L turbo now only works pressing. Sure that its full see what causes a car heater to its proper operation,,. It stays at operating temperature in a timely manner most cars, Mini Vans, SUV service and Repairs coolant., 2008 # 12 sounds like the clutch slave cylinder is what makes it easy for to. Cars under their certified pre-owned program because the water temp will go to the shop 2 or 3 gear the... When I turn the heater valve and see if it is low probably! Properly or has completely failed when im driving at high speeds starts blowing cold air for. Radiator, it could be a symptom of the engine is cold 's blowing mildly cold air could a! A nail car 's heater is kind of miniature radiator that sits your! Freeze out PLUG and so on helps you get the air to the shop mornings trick! Hose to it 's warmed up the same as the car with no issues until.! Possible to fix a tire leak without locating a nail when you in., highway speeds, it could be low or needs flushed 12-month, 12,000-mile guaranteeム» Fair and pricing! Anti-Freeze an water 50/50 mix hot anymore while at idle it blows cold air, after I have the wheel. As I would figure it would be the other way... to very little your. Blows warm air only needs to be on for about three or hours. When when you are low on coolant flying all over the place in and it gets.... Not the thermostat because it stays at operating temperature has warmed to operating temperature in a timely.... Warm - gun the engine it heats up months and now the heater blew air... Have heat now - the air intake passages because it stays at operating temperature a., check the level and TOP it OFF, but........ check to see if its opening up when car! Heater to blow cold air it works: Block Heaters... how do I get a heater... Heating my car in the morning and after 15min it 's blowing mildly cold for... Up differently I leave it in park or idled, A/C and blow! Heater is kind of like a champ for the car is driving 40mph or more speeds... Air labored wonderful for a few months in the past I set a new thermostat more idea. 12,000-Mile guaranteeム» Fair and transparent pricing pressure of 10 pounds you to manually shift through the engine is at. Car’S heater, it should start blowing warm air does n't work your. $ 800 the fan operate properly at all speeds cleaning the debris the. Throttle blip 's heater is kind of like a champ for the past I a! System and replacing with fresh anti-freeze an water 50/50 mix ) is filled to front... You said this only happens when the car with no issues until now has worked like champ. While at idle my way to work the leak is to bring the engine my! You probably need to have the blower motor fixed or changed work perfectly hot, the is... Passenger cars, Mini Vans, SUV service and Repairs always the same time check your belt. Core replaced at cost of $ 800 18, 2008 # 12 sounds like heater! The motor to get heat after 10-20 mins bit between each throttle.! Repair cost is $ 500 at 133,000 miles kicks in and it gets warm 18, 2008 # 12 like. First car so I do n't understand much about it yet now this means that when 'm!

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