Question about 1999 GMC Jimmy

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Blend door 1999 jimmy

Blows hot air

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  • Anonymous Dec 11, 2008

    cannot control temperture either freezing cold or boiling hot

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3 Answers

Thank you hurst

Posted on Aug 04, 2008

Friend fixed it, i took it apart and there was a crack in the main gear at the shaft. thank you, new one 137,

Posted on Aug 04, 2008

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Check the blend door motor under (behind) the glovebox. make sure the ac system is cooling first.

Posted on Aug 03, 2008

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2 Answers

Blows hot all the time.


I fixed the problem. It was the blend door actuator, but the wheels continued to turn because the reset operation requires resistance to know when the blend door is at its limit for the hot and cold side. At least that is what I assume. If the actuator is tested off of the blend door, it will simply turn until it can't turn anymore. After installation, it worked fine.

Jun 22, 2008 | 1998 GMC Jimmy

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