Found similar thread for 2007 Chevrolet Silverado. Radio speakers come and go. No common circumstances to make them work. Sometimes just driving down the road they all suddenly come on. Usually the front left works, and the others come and go. But lately only the front tweeters working. Can't listen to it like that. Very frustrating and wish someone would post the fix for this. Finding lots of similar complaints on line but no answer. Knowing plastic parts in dash and doors will probably break from age if I try to remove the radio or door panels, I don't want to start tearing it down until I know what I'm looking for.