Question about 2001 Chevrolet Blazer

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I am having heater issues.... it works great driving down the road but when im idling the heat turns to cold. after giving it some gas for a few seconds the heat comes back but after about 10 seconds of idling the heat turns back to cold again. any idea what could be causing this?

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There could be several causes for this.
The first thing I would check is to make certain that the coolant level if filled properly. Low coolant levels can contribute to this, at idle the coolant will not be circulating properly leading to not enough coolant going to the heater core.

Secondly, either your heater core or radiator may have slowly over time become corroded and is restricting the coolants moment through the engine and as your engine gains "RPM's" the coolant is circulated faster.

There is an outside all be it small chance that the water pump maybe failing also.

I would first check to make sure there is a proper amount of coolant in the reservoir, if it is full or close to it I would then check to see how the circulation of coolant differs from idle to under engine acceleration.

Posted on Nov 09, 2010

Testimonial: "I think your right! thats the good news. The bad news is i got a leaky radiator. my day off tomorrow. looks like i'll be workin on that. Thank you!"

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Posted on Jan 02, 2017

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