When I bought our truck it was already 10 years seasoned plus it had an aftermarket boombox installed. It was Summer when I bought the truck so I didn’t discover the minor flaw that it has until Spring. The boombox overheats plus shuts off if the air conditioner is not running. The air conditioner vents run on either side of the boombox plus they kept it cool plus running well all Summer long! During the Summer weeks, I never drove the truck without the air conditioning system running as well. When fall came, I turned off the air conditioner plus drove with the windows open plus the boombox shut off. When I evaluated it, it felt very warm to the touch. I turned the air conditioning system back on, waited awhile, plus the boombox worked again. Since then, I have discovered that running just the vent on low is also passable to keep the boombox cool, and running the furnace in the truck is not. So if I want to open the window, I need to make sure that I keep the vent air going too. If I want to run the heater, I can’t use the boombox. This is all very annoying but I don’t want to take the dash apart to update the boombox. It just reminds me of computer rooms that are kept extra cool, with strong air conditioner, so that PCs don’t shut down in office buildings. Except, this isn’t an office, this is a truck. Oh well, I believe that’s what you get when you buy an older used vehicle: there is always some glitch of some kind.