rjnegron

If someone can help me I would truly appreciate it. I have a 05 TB EXT with dual AC. About 1 month ago the rear AC fans started coming on by themselves, all controls are turned off and the vehicle is not running and they still come on. Sometimes they run high and sometime low. I am currently getting a copy of the wiring diagram but it would save me a lot of time and possibly alot of money if anyone else has had the same problem and found the source. Thanks.

501trxr

Thought I'd bump your problem up since I have a similar issue with the FRONT AC/heat control on our 2003 trailblazer xt (70,000 miles). The fan does not always run and when it does start working you can't shut it off. Basically, the dash control seems useless. It continues to run with key off. I've resisted taking this vehicle to a dealer because I can't afford a $500 repair bill before Christmas, but my wife is fed up. She wants to trade it in, but we've only had it for a few months.
The sad part is I sold our bulletproof 97 suburban with 180,000 miles a few days after buying this Trailblazer lemon. I call it a lemon because of numerous other minor issues we've had in the short time we've owned it. Would not recommend this computer controlled electrical nightmare of a vehicle to anyone. I have had good luck repairing my own vehicles in the past, but with all this computer controlled crap on the Trailblazer, I have no clue where to start.
Thanks for reading my short rant!