When I bought our truck it was already 10 years old and it had an aftermarket stereo installed. It was summer time when I bought the truck so I didn’t discover the minor flaw that it has until Springtime. The stereo overheats and shuts off if the A/C is not running. The A/C vents run on either side of the stereo and they kept it cool and running well all summer time long, and during the summer time weeks, I never drove the truck without the A/C running as well. When fall came, I turned off the A/C and drove with the windows open and the stereo shut off. When I checked it, it felt truly tepid to the touch. I turned the A/C back on, waited awhile, and the stereo worked again. Since then, I have discovered that running just the vent on low is also sufficient to keep the stereo cool, then 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 stereo. This is all truly annoying even though I don’t want to take the dash apart to upgrade the stereo. It just reminds myself and others of tablet rooms that are kept extra cool, with strong a/c, so that tablets don’t shut down in office buildings. Except, this isn’t an office, this is a truck. Oh well, I think that’s what you get when you buy an older used vehicle: there is always some glitch of some kind.