Question about 2000 GMC Jimmy

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No heat comming out of fan

I have no heat comming out of the vents . I have replaced the temper gage themous stat , flushed the radiator out . What else could it be?

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  • Anonymous Oct 01, 2008

    I had the same issue. I was working way to much to fix myself. I drove to my local goodyear and expecting a 500$ bill but nope. 30$ later and a quick flush of the heater core and it was all set. Good luck im sure its the problem. You may want to eventually change the heater core due to build up or you could just flush out every year if that suits ya. 50$ for a heater core at autozone.

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These are well known for clogged Heater Cores. I would have the heater core flushed if possible.

Posted on Sep 14, 2008

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Why still over heating, replaced all last year, water pump, stat, flushed rad


Possible causes....Poor internal circulation or heat exchange due to blockage or corrosion/scale.
Likely causes.... Electric rad fan (if so equipped) failing to turn on, or broken fan belt (if so equipped), or broken, damaged or missing fan blades, or blockage of air into radiator (lots of bug guts, plastic, paper, debris in general), or damage to radiator itself. (cooling fins are mostly bent over restricting air flow or circulation, scale build up inside of the radiator...not always "flushable" preventing good heat exchange.
One or some of these maybe causing your grief. Good Luck.

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