H3T A/C Issue - Hummer Forums - Enthusiast Forum for Hummer Owners


Hummer H3T The popular H3 gets the added capabilties of a small pick-up, with the look and performance of the original H3.

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Old 06-09-2017, 11:27 PM
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Location: Argyle, TX
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Default H3T A/C Issue

Okay - have a 2009 H3T Alpha in Solar Flare. A/C works, but cold air only comes out when the variable temp **** is turned all the way to Max. If I turn it off of max, back to slightly warmer - it starts to blow hot air - no in between. Feels like a temp sensor or something like that? Could it be since I installed a head unit - maybe I didn't plug everything back in correctly?

Thanks in advance
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Old 06-10-2017, 06:11 AM
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It is a known problem, make sure you use a new ac control unit as the old ones do this regularly


<a id="d39265e24">Condition/Concern:Some customers may complain that the temperature will go to full hot when they turn the temperature control one click off of full cold. The control head is defaulting to Emergency Mode (this provides HOT air for safety reasons which would be available to clear the windshield in Defrost mode). This will happen if the feedback voltage for the air temperature actuators are out of range.


<a id="d39265e34">Recommendation/Instructions:Replace the HVAC control head with part number 25920831
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Old 06-10-2017, 07:24 AM
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Thanks a ton sycraft - appreciate it
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