Please Help diagnose Climate control problems on 05 Sierra Crew-Cab
I'm so happy I found this forum! Hope someone can help! My problem is my 2005 GMC Sierra Crew Cab SLE. The dual climate control is acting strange. In the past year or so it would randomly start blowing hot air while the AC was set to cool. I would stop the truck, turn it off, remove key and open the door then restart. That seemed to clear it up til the next time which would be a month or so later. Unfortunately, it is now stuck on HOT on the drivers side and pass side works fine. I can change the temp on the passenger side. The rear vents must be tied into the drivers controls as they also only blow HOT. I did just replace the original battery the day before this started happening. Coincidence? I read somewhere to remove the HVAC fuse and that would reset the system but no luck there. What should I try next? Or, will this require a trip to the dealer? Thanks for any input you may have.
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Try this actuator recalibration procedure.
With the ignition switch in the on position, remove the HVAC/ECAS fuse for a minimum of 10 seconds. This fuse is located in the under hood fuse/relay box.
Re-install the HVAC/ECAS fuse.
Start the vehicle.
Wait 40 seconds for the HVAC control module to self-calibrate
Try this..... it SHOULD work
This is a common problem after the battery has been disconnected.
no disconnecting the battery is why it's doing it start with.
have u tried the key on 3sec key off then on 3sec off then start it, let ac blow on hi for 10 to 15mins. if that don't work with key on (not running) pull the ac relay under hood wait 10secs an put back in.