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  #1  
Old 11-29-2011, 09:37 PM
TZ250 TZ250 is offline
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Cold Air When Idling

Guys,
What would cause my heater to blow cool air when idling, but warm/hot air when driving?

I'm baffled.


Thanks in advance.
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Old 11-29-2011, 11:06 PM
Tech II Tech II is offline
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Re: Cold Air When Idling

Well, it sounds like a vac problem....but the way you describe it, is the opposite of what I would expect...if your temp valve is vac operated, and the check valve to the vac tank is bad, you would lose vac at open throttle, and would gain vac again at closed throttle......
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Old 11-30-2011, 12:46 AM
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Re: Cold Air When Idling

Have you checked your coolant level ? That can cause the scenario you have described .
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Old 11-30-2011, 10:58 AM
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Re: Cold Air When Idling

What is your temp gage doing?
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Old 12-04-2011, 11:56 AM
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Re: Cold Air When Idling

Is the water pump impeller eroded? I've seen that more than once.
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