2002 GMC Envoy AC heat haywire

Asked by GuruNVC7W Oct 21, 2019 at 08:46 AM about the 2002 GMC Envoy

Question type: Maintenance & Repair

About 25% of the time, the heat and
AC work fine. But most of the time, it’s  
going crazy. The first indication will be
the display flashing and/or completely
cutting off. During the summer, I’d
have the AC on and all of a sudden it
would blow hot air, I can’t use the
controls and display flashing, until out
of nowhere, it settles down. Now with
cooler weather, it’s the opposite. With
the heat on, freezing cold air will start
blasting. Any ideas?

1 Answer


Sounds like you have automatic climate controls, meaning digital. I'd look to the blower motor control module first. Check the pigtails for any signs of getting hot or melting too. It's located behind the glovebox.

Your Answer:

Sell Your Car Yourself

With a simple, secure transaction.

2002 GMC Envoy

I have a different car

GMC Envoy Experts

  • #1
  • #2
  • #3
View All

Find great deals from top-rated dealersTM


Related Models For Sale

Used Chevrolet Trailblazer
28 Great Deals out of 8,823 listings starting at $1,899
Used GMC Yukon
283 Great Deals out of 11,347 listings starting at $2,950
Used Chevrolet Tahoe
653 Great Deals out of 23,570 listings starting at $2,000
Used Ford Explorer
1,337 Great Deals out of 68,845 listings starting at $995
Used GMC Envoy XL
3 Great Deals out of 186 listings starting at $1,950
Used Jeep Grand Cherokee
1,415 Great Deals out of 67,263 listings starting at $1,888
Used GMC Sierra 1500
790 Great Deals out of 37,885 listings starting at $1,999
Used Chevrolet Silverado 1500
1,963 Great Deals out of 103,504 listings starting at $1,350
Used Ford F-150
2,870 Great Deals out of 136,722 listings starting at $1,495
Used Honda Pilot
555 Great Deals out of 36,888 listings starting at $999

Used Cars for Sale

2009 GMC Envoy For Sale
18 listings starting at $4,950
2008 GMC Envoy For Sale
4 Great Deals out of 89 listings starting at $2,050
2007 GMC Envoy For Sale
94 listings starting at $2,999
2006 GMC Envoy For Sale
4 Great Deals out of 102 listings starting at $1,999
2005 GMC Envoy For Sale
79 listings starting at $1,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.