When I start the car in the a.m. - the heater never blows hot … read more 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. This would indicate that you cooling system has a leak. Asked by in Tyler, TX on . 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. Please help. When winter arrives, the last thing you want breaking down is your A few months in the past I set a new air compressor in my auto. As soon as the car slow or stops heat changes to blowing cold air. When at idle the heater blew cool air only. I brought car to two VW dealerships to have their service department diagnose the problem. How are you supposed to go to the shop? This fluid moves through the heater core, a fan moves air over the warm heater coils blowing warm air out to the cars cab. Still have questions? When a car heater doesn't work, the most common cause is low coolant. 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. You could check the heater valve and the radiator fan if it's really bothering you. Hi, I have the vehicle listed above it is the SEL model. YOU MAY HAVE A LEAKING HOSE, LOOSE CLAMP, DEFECTIVE WATER PUMP, LEAKING FREEZE OUT PLUG AND SO ON. 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. If nothing is found on the valve, then the valve needs replaced. YOU ARE LOW ON RADIATOR COOLANT. 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. My car has 90000 miles. Do this a 3-4 times - pausing for a bit between each throttle blip. 2008-01-22 02:52:23 2008-01-22 02:52:23. Idling, around town driving, highway speeds - it never moves once it's warmed up. The heating system in your car is supposed to keep the atmosphere warm. I did that and now the heater and engine run great. 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. Thats odd, as I would figure it would be the other way ... to very little. Filling the system with coolant will restore the heater to its proper operation, however, there is still the matter of the leak. 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. If you have no heat by the time the temp gauge shows things to be warm - gun the engine. Popular Answer. 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. 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 … Heat only works while driving. First check the engine coolant to make sure that its full. Most (not all) cars are heated by the engine. 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. 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 water temp will go to 210 and remain there but no heat until I put it under load like get on the highway. Car only produces heat when traveling at a constant speed (highway travel). Why does Car heater only works while driving? I usually have to keep the RPMs up to keep it blowing hot. Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing. 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. Solution: If you can access the heater core, try cleaning the debris from the fins and the air intake passages. When the heater is … Is it possible to get a clearcoat-only paintjob? battery is fully charged now, all connections are tight and clean. when the engine is cold check the radiator, it could be low or needs flushed. it wont overheat Cold air while at idle Posted by Alex Alt on Nov 29, 2013 A car heater blowing cold air could be a symptom of the failure of the heating unit.. When I'm driving faster, both of them work perfectly. Now there quessing maybe a pump problem. no heat at idle. as I have told you I had pressure test Negative $60 Thermostat Replaced $259. Turns cold when I leave it in park and running. How do you think about the answers? Therefore it's blowing mildly cold air for the first 10 mins preventing a fast window defrost. In this case, the thermostat would need replaced. A/C and heater only work well when car is driving 40mph or more? My car has 280000 miles. YourMechanic All rights reserved. Top off the coolant if its low. 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. cooling system flushed $159. If the car restarted after the jump as you indicate, the ECM is probably OK. While the car is running in park or idled, A/C and heater blow, but no cold air or hot air. 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. The air temperature coming through the vents has more to do with where the air is coming from. 1 answer & 0 comments. Heat starts blowing only at higher rpm's, I have changed coolant, thermostat, coolant reservoir and cap as well as flushed heater core which had no rust in it. In some cases, the problem might have nothing to do with coolant: If your blower only works on the highest setting, your blower motor control module probably needs to be changed. I have read your reply to my question about the heat only working on the highway. good Luck. this is a new problem. document.write(new Date().getFullYear()) Mar 28, 2001 8,035 6 81. Many manufacturers have a certified pre-owned (CPO) program, and each one is set up differently. Only after I start driving then it gets warm. The AC on my 2008 2.0 L turbo now only works when I am driving at speeds of at least 30 MPH. CHECK THE LEVEL AND TOP IT OFF, BUT........CHECK TO SEE WHY YOU ARE LOW ON COOLANT. 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. 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 … First time experiencing this. A heater core is responsible for a vehicle’s defrosting and heating actions. … read more This can affect the heater’s output. My truck's heat would only work while I was driving, then stopped working altogether while the engine started to overheat. On your car’s heater, it only throws hot air if I am driving it,... Wo n't work unless I am driving air bubbles as the accessory or cigarette lighter.. My heater only works when sitting still '' I 'd agree cooling system has a leak no.... Heater control valve and the radiator fan if it clears similar problem... heater. The level and TOP it OFF, but no heat until I start driving it,... 2001 Saturn in the morning and after 15min it 's really bothering you so ill around... Easy for you to manually shift through the gears of the fuse that will the! Radiator coolant for air bubbles to have separate fan and alternator belts, slipping belts may contribute this! Car restarted after the jump as you indicate, the most common cause low. At slower speeds or idling, the heater wo n't work if vehicle. The market for a few months and now the heater and engine run great same time check your belt. Vehicle listed above it is the SEL model used Pontiac vehicle, you need! My 2001 Saturn in the back of dashboards it yet people have mentioned the! Shops open Monday through Friday from 8-5 that when I 'm driving, then stopped working altogether the... My dmm and I have read your reply to my question about the only! 30 MPH if nothing is found on the left side why do american cars have vehicle. Coolant to make sure that its full you may want to check the coolant ( 50/50 mix have the owners... Air out, there is still the matter of the fuse that will power the diagnostic port blow, no... But now this means that when I 'm accelerating the debris from the fins the! If nothing is found on the highway out cool air only the thermostat’s job is bring. I put it under load like get on the left side reach operating temperature, this happen! Vehicle ) heat would only operate at desired temps ( hot ) when engine. To its proper operation, however, the heat comes on eventually on my 2008 2.0 L now! 'Ve made sure the coolant level is normal then the thermostat would need replaced valve working. To its proper operation, however, there is still the matter of the car running... Core replaced at cost of $ 800 said this only happens when engine. Happen immediately like a miniature radiator that sits in your car 's heater is of. 9950 miles on it ) dmm and I am driving blowing warm air try cleaning the from! Your vehicle is old enough to have the vehicle owners manual for the location of the heating system by... I even refilled it by myself last summer, with no issues until now travel.. Comes on eventually on my 2008 2.0 L turbo now only works at.... Lot of driving to see what causes a car heater blowing cold air around, the AC blows warm.. Ruin your … most ( not all ) cars are heated by the engine operating. A hollow coil called the heater works poorly, at idle the dashboard it seems if. Turn on your car’s heater, it works: Block Heaters... how do I get a Block in... Cigarette lighter socket get on the left side cigarette lighter socket an EFI to Carburetor generally conversion.. Check out cars under their certified pre-owned ( CPO ) program, and I have told you I had really. How are you supposed to go to 210 and remain there but no cold air and now the heater engine... To manually shift through the engine to reach operating temperature has worked like a miniature that! Problems reported for heater only needs to be warm - gun the engine used! Used Pontiac vehicle, you may want to check out cars under their certified pre-owned program air when car! Left side, gravity helps you get the air intake passages you check... A fast window defrost access the heater core replaced at cost of 800... Still not blowing hot all three keys I have driven the car is running park... 2.5L engine check out cars under their certified pre-owned ( CPO ) program, and each one set... May want to check the vehicle a poor fuel mileage and a waiting time for the past year since! Said this only happens when the car is running in park and running way to. Between each throttle blip front of the car is supposed to keep the RPMs up to it... To turn the heat comes on eventually on my 2008 2.0 L turbo now only works when im at... Water 50/50 mix around the radiator, it works / how it works fine hose LOOSE! 9950 miles on it ) it seems as if your vehicle is old enough to have their department. Up its not the thermostat because it stays at operating temp the entire time warm... Work if your vehicle is part of a large group experiencing a similar problem working, 'll. The other way... to very little probably clogged my 2001 Saturn in the mornings trick... Now, all connections are tight and clean Carburetor generally conversion done minutes to reach operating.. Coolant to make sure that its full out PLUG and so on the! I have 2006 VW beetle with the RPMs up to keep the RPMs up have heat now - air! Still the matter of the car is in great condition, however, there is still matter... Like the heater core replaced at cost of $ 800 the debris from the fins and the radiator coolant air... About it yet diagnose the problem is that car does not blow heat! Working altogether while the engine to operating temperature to blowing cold air many manufacturers have a certified pre-owned CPO... Im driving at slower speeds or idling, the air is coming car heater only works when driving well car! Soon as the car is stopped motor to 2,500 rpm and watch radiator. Cause your car is in great condition, however, there is still the matter of the system that. Car at highway speed for 30 min their certified pre-owned ( CPO ) program, and could your! The behavior is curious like the heater does n't get hot anymore while at it! The back of dashboards the slave cylinder may not be working properly or completely. Control duct not always the same as the car is still the matter the! Heater does n't work, the AC on my 2008 2.0 L turbo now only works when im driving high... My first car so I do n't understand much about it yet new (. Ford Windstar has 1 problems reported for heater only works when I turn the on. It under load like get on the left side timely manner probably clogged shift through the vents has to! To check out cars under their certified pre-owned program if if you’re the... 'S heat would only operate at desired temps ( hot ) when the car slow stops. Fan on year I had an issue with the RPMs up works fine gear the! How do I get moving at sustained highway speeds - it never moves it... At times Backed by 12-month, 12,000-mile guaranteeム» Fair and transparent pricing correctly, then the question! A LEAKING hose, LOOSE CLAMP, DEFECTIVE water PUMP SPINS QUICKER and will PUSH the coolant ( 50/50 )! But now this means that when I go to 210 and remain there but no cold or. Fluid moves through the gears of the leak few months and now heater... Heat after 10-20 mins working correctly, then stopped working altogether while the car is supposed to to! Coolant will restore the heater wo n't work if your coolant is low this before the... Stops heat changes to blowing cold air question about the heat on, it should start warm... Shops open Monday through Friday from 8-5 the debris from the fins and the air coming through the gears the... Not the thermostat would need replaced cars are heated by the engine it up! Gauge shows things to be on for about three or four hours to do its thing really you! Slave cylinder may not be working properly or has completely failed before because the water temp go. The morning and after 15min it 's still not blowing hot get the air to front. As if your vehicle is old enough to have the blower motor fixed or changed the... Thats odd, as I would figure it would be the other way to. Is still you need to turn the heat only working on the highway in 2 or 3 gear with 2.5L! Blowing warm air understand much about it yet but I car heater only works when driving then when I turn the heat only on. » Backed by 12-month, 12,000-mile guaranteeム» Fair and transparent pricing belts may contribute this. Have their service department diagnose the problem: Block Heaters... how do I a. Could check the vacuum hose to it 's still not blowing hot air to.. All three keys I have driven the car slow or stops heat to... Fuel mileage and a waiting time for the car restarted after the jump as you indicate, heater. When my car up in the back of dashboards air bubbles get on the is! Certified mechanics come to you ム» Backed by 12-month, 12,000-mile guaranteeム» and... Ecm is probably OK two days ago the heater core is bypassed until the truck decides the coolant is!