Problem with '08 Trailblazer Factory Radio/Speakers

I have a 2008 Trailblazer LS with factory speakers and radio. Recently, the radio went out - - it sounds like all speakers are blown, and the back speakers don't even work. However, when it is sunny outside, and the car sits out in the sun for an extended period of time, all speakers (except the front passenger) magically begin working again. They will stay working until it rains or until the car cools down at night. This seems to tell me that everything is basically fine with the speakers, but there is a loose connection somewhere.

Thanks for help!

 

Sounds like you have a cold or broken solder joint inside the radio somewhere. You would have to open up the radio case and look at the pc boards.

 

Thanks for answer,

well I did that already I opened lower dash took radio out. All looks pristine, no moisture, or other damage, I sprayed all connectors with contact cleaner, no change of behavior whatsoever. I agree that it looks like some funny connection somewhere, what I read on different forums it is not uncommon problem, I am still hoping that somebody knows where (what connector or at least part of system wiring) is possible funny contact most likely. I amplanning to open rear right side and check power amplifier this weekend this is my next guess.

Thanks!