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My 2005 GMC Envoy

Tiny
ANONYMOUS
  • MEMBER
  • 2005 GMC ENVOY
  • 96,000 MILES
My 2005 gmc envoy. Sometimes the heat and defrost work, and at other times the heat and defrost don't work. What is the problem and is it an expensive problem? I just had the thermostat replaced.
Sunday, November 25th, 2012 AT 5:08 AM

1 Reply

Tiny
DRCRANKNWRENCH
  • MECHANIC
  • 3,380 POSTS
I am giving you a diagnsotic walk thorugh for your situation. Just use the link below to get to it.
I believe you have a bad actuator for an air control door or a braken air control door.
Here is the link;

https://www.2carpros.com/articles/car-heater-not-working
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Sunday, November 25th, 2012 AT 5:14 AM

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