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2004 gmc
26,436 Posts
Have you recently discharged your battery or swapped it out? Trailvoys are notorious for having a misdesigned HVAC actuator (used for temp, airflow mode, and so forth) that works just fine until the control module loses its memory when you replace the battery. Then one or more of them mess up during recalibration and have to be replaced.

Run a search for "temp actuator" or "Mode actuator" and read up for a bit. If you're not a DIY kind of person, and take it to a mechanic, do NOT accept any claims that they have to remove the entire dash for $1000 to swap it.

What's gone bad for you is the driver's side temp actuator.

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