Question about 2000 GMC Jimmy

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2001 gmc jimmy defroster-heater blower will not direct heat

My 2001 gmc jimmy has good heat, and blower levels work. Heat will only blow through vent and not to defroster (windshield).

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  • 01gmc Mar 18, 2009

    2001 gmc safari air only blows through defrost only other post suggest loss of vacuum but need to locate vacuum line need some kind of diagram

  • Anonymous Mar 17, 2014

    were is the heat control valve on 1996 gmc jimmy

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  • 239 Answers

You have a vacuum leak

Posted on Jan 07, 2009

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If I remember correctly the mode door is vacuum operated. Check to make sure that there is vacuum to the control head. If not is is possible you knocked the vacuum line off when replacing the heater core. The default position for a vacuum controlled mode door on just about every vehicle is the defrost position. This is so if there is a failure in the system you will at least still have a clear windshield to see through.

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Your going to have to replace the switch. The switch it self may have gone bad, since it works on a vacuum. It's common for the diaphragm in the switch assembly to go bad, if it's not the switch. Then it's going to be a bad actuator door and will need to be freed up. I have found it to be the switch it self get dirty and the vacuum needed to activate the actuator door is not there.

Good luck and keep me posted. When you turn the switch from defrost to heater, do you hear a air leak??? If you do then it's a good chance that it's the switch it self.

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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.

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