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. 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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 ã»Backed by 12-month, 12,000-mile guaranteeã»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 carâs 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. 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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 (. 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