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GMC H2: My 2004 Hummer H2 was blowing hot air on one side of

Customer Question
My 2004 Hummer H2 was...
My 2004 Hummer H2 was blowing hot air on one side of the car and cold on the other. Now its just blowing hot air on both.
-I need troubleshooting steps
-diagrams
-someone with specific knowledge on this issue
If you have only basic advice that leads up to taking it to the dealer don't bother. Sorry I have been burned before on this service...
Submitted: 2 years ago.Category: GMC
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Answered in 7 hours by:
7/29/2015
GMC Mechanic: Gary, ASE Certified Technician replied 2 years ago
Gary
Gary, ASE Certified Technician
Category: GMC
Satisfied Customers: 17,276
Experience: GCM master tech over 25 years
Verified
I am sorry for the long waitthere are many things you can check and test to find the problem but to be honest with you this can lead to programming the heater ac controller with updated programming to correct this issuewhen this happens and both sides are warm or hot air with the truck running and the AC on is the compressor running ?
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Gm Tech (Cam)
Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
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Experience: GM Grand Master Technician 2007. 14 year experience.

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Gm Tech (Cam)

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