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post #1 of 24 (permalink) Old 10-07-2010, 10:15 AM Thread Starter
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Hot air in motion, cold air at idle

Need some help narrowing down a problem with my HVAC system. With the ATC set to high, at max temp, hot air blows out when the car is in motion. As soon as I stop at a light, cold air blows out. The cycle keeps repeating with hot/cold depending if the car is moving or stationary. What would cause this? AC works fine. Possible air trapped in the system?
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post #2 of 24 (permalink) Old 10-07-2010, 10:44 AM
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Check your coolant level. That's what happened to me in the same situation. If I reved the engine when I was stationary, the heat would come back. So it wasn't a question of moving or not...it was low RPM's vs. higher RPM's. I brought the coolant level up and no problems since.

Last edited by ronbiggs; 10-07-2010 at 10:47 AM.
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post #3 of 24 (permalink) Old 10-07-2010, 11:56 AM
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Any "sloshing" sounds heard deep inside the dash ever? Agreed - could be a matter of low coolant. Maybe.

Is the temp gauge reading normal at idle vs in motion?
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post #4 of 24 (permalink) Old 10-07-2010, 01:08 PM
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just had one like this a few weeks ago,, low coolant,, crack open the bleeder screw and pour some in till it runs out the bleeder,, close bleeder and enjoy
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post #5 of 24 (permalink) Old 10-07-2010, 01:39 PM Thread Starter
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Thanks everyone. Hopefully the issue is just low coolant.
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post #6 of 24 (permalink) Old 10-07-2010, 04:19 PM Thread Starter
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Well I'm all out of Mopar and Zerex G-05 coolant. I do have some Prestone extended life lying around. I assume this can be mixed with Mopar without any concerns?

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post #7 of 24 (permalink) Old 10-07-2010, 05:09 PM
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Well I'm all out of Mopar and Zerex G-05 coolant. I do have some Prestone extended life lying around. I assume this can be mixed with Mopar without any concerns?

I don't know how the different kinds work together. I used the Prestone, but that was when I changed the WP/TB and T-stat, so it was pretty much a full flush.

I think the Prestone stuff is ethelyne glycol and it says it works with all colors (although I would not mix it with the GM DEX-Cool stuff)
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post #8 of 24 (permalink) Old 01-10-2011, 03:58 PM Thread Starter
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Update:

Coolant flush performed, coolant topped off, problem still present. Any other ideas as to what it may be? No weird noises, cold air comes out with temp on hi (regardless of other settings) unless the RPM's are above 2K. Temp gauge reads normal at idle vs in motion.

Last edited by primetime; 01-10-2011 at 04:00 PM.
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post #9 of 24 (permalink) Old 01-10-2011, 06:23 PM
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Quote:
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Update:

Coolant flush performed, coolant topped off, problem still present. Any other ideas as to what it may be? No weird noises, cold air comes out with temp on hi (regardless of other settings) unless the RPM's are above 2K. Temp gauge reads normal at idle vs in motion.
Did you bleed it when you refilled it after the flush? Maybe there is an air pocket. Otherwise maybe the WP is going and doesn't provide enough circulation until it is at higher RPM's. How is the engine temp after full warm up? Does is stay constant?
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post #10 of 24 (permalink) Old 01-10-2011, 06:32 PM Thread Starter
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WP was replaced 40K miles ago. Engine temp stays constant, the needle on the temp gauge is in the middle. I'm wondering if maybe the drive belt is loose?
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post #11 of 24 (permalink) Old 01-10-2011, 07:57 PM
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has there ever been stop leak in the car?
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post #12 of 24 (permalink) Old 01-10-2011, 08:22 PM
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I had the same thing happen to me (no heat at idle, heat while driving). but with mine, if left long enough it would start to overheat at idle. Radiator failed days later.
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post #13 of 24 (permalink) Old 01-10-2011, 10:37 PM Thread Starter
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has there ever been stop leak in the car?
Nope. To give a more detailed description, once the engine gets to normal operating temps (it was 39F outside tonight, and the needle on the temp gauge was slightly below the middle) the problem goes away, and the heater blows hot air at low rpms and at idle. As the engine is warming up, whenever the RPMs are low, cold air blows then as soon as the RPMs increase, it's instant heat. Temp gauge never went to half way even, so no over heat issues. Didn't start happening until October.
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post #14 of 24 (permalink) Old 01-10-2011, 10:50 PM
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i would say you probably have some circulation problems with coolant going through the heater core considering its full of coolant. in these situations i like to flush out the heater core and see what happens. usually it is succesful unless you have a highly clogged system. also, dont be mixing any green coolant with the red mopar zerex
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post #15 of 24 (permalink) Old 01-11-2011, 07:35 AM
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Quote:
Originally Posted by primetime View Post
Need some help narrowing down a problem with my HVAC system. With the ATC set to high, at max temp, hot air blows out when the car is in motion. As soon as I stop at a light, cold air blows out. The cycle keeps repeating with hot/cold depending if the car is moving or stationary. What would cause this? AC works fine. Possible air trapped in the system?
What are the chances that the water pump is NOT turning at idle? Does the heat come on when you rev the engine or only when the car is moving?

If you thought that the water pump might be binding on the cover, try either pushing on the cover when running (CAREFULLY!) or loosening the cover and moving it so it can't touch the water pump. Neither one costs anything and you might discover the solution. In my opinion, the cover bolt holes are too big a diameter which allows one to place the cover in a position to bind (or at least grind) the water pump.

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