Question about 2000 GMC Jimmy

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My 2000 GMC jimmy does not blow out hott air. The blower works and the a/c works very well. The thermostat fluctuates from the middile to the high side. and when i start driving it goes back down to idle. what is the cause and how do i fix it?

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Plugged heater core

Posted on Aug 26, 2010

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3 Answers

My 2000 jimmy has heat problems. the heat goes from cold to hot to warm to cold etc. what could the problem be?


If the temp gauge is now more stable, the problem is in your heater system, not the engine cooling system.

Sep 12, 2014 | 2000 GMC Jimmy

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My 2000 gmc jimmy blow cold air heater


common for this vehicle to have clogged heater core

Dec 16, 2012 | 2000 GMC Jimmy

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MY 1999 GMC JIMMY DO NOT BLOW HOT AIR, I TAKE TO FEW MECHANICS AND ANY ONE CANOT FIX\


It could be the thermostat,make sure the air is bled out of system after replacing.if it runs at a normal operating temp,then i would say it is your heater core,also if it has a reostat it could be bad,it is a little circuit board down by your blower motor,it has different thicknesses of wires coming off it like light bulb elements.

Jan 09, 2011 | 2000 GMC Jimmy

1 Answer

The heater does not blow hot air in my 2000 GMC Jimmy, what could be the problems?


check the antifreeze level, if it is ok change the thermostat

Dec 13, 2010 | 2000 GMC Jimmy

1 Answer

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Try checking the fuse's, if the fuse's are good it could be a bad blower motor.

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3 Answers

2000 GMC Heater Problem


I had problems with a similar truck,a 1998 GMC diesel after checking to make sure the control cables were operating the blend door and blowing the mess of the heater core,I replace the thermostats.Still no heat turns out there was a small amount of debris collecting in the fitting for the inlet hose at the thermostat housing after removing it and blowing out the lines the heat was fine.

Nov 19, 2008 | 2000 GMC Jimmy

2 Answers

200 gmc jimmy st heater


Had similar problem in my 2000 Jimmy. No hot air from heater. Had the shop (Midas) disconnect heater hoses at the fire wall and blow out the heater core with air hose. Got rust and junk blown out. Hooked up and flushed system with new anti freeze. Got lots of heat now.

Oct 25, 2008 | 2000 GMC Jimmy

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