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1998 GMC Jimmy Too Much Heat in Vehicle

Tiny
CRASHHELMET
  • MEMBER
  • 1998 GMC JIMMY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 129,000 MILES
I don't know if the problem is with my heater or if something is causing my engine to vent inside my Jimmy. I can have the heater turned off and the dial turned all the way over to it's coldest settings and hot air will continuously vent inside. Also, if I turn the AC on, it's nothing but hot air as well. I don't appear to have any problems with coolant or overheating. I'm not sure where to start looking to fix this problem.
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Tuesday, May 12th, 2009 AT 7:39 PM

1 Reply

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hi
Fault is with blend door acctuator it is vacuum controled so either master switch is faulty or the dashpot on HVAC unit. Check up under pass dash find
dashpot going to lever on top of box. Should move when control moved from heat to cool.
Let me know
Thanks for donate
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Wednesday, May 13th, 2009 AT 10:09 AM

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