Ok, Ive had this car since new. It was actually my wifes car which I inherited when she got the kid bus (2005 Expedition) anyways, the cars audio system used to be rockin for a stock sysytem, but last year something happened. I noticed that my rear speakers are out. But whats funny is that on a warm day, when my car gets all hot inside, they work. Anyone with any sugesstions? The warranty is obviously gone and I dont wanna take the car in for some rediculius rice to get this fixed if I could do it myself. I checked the connects from the trunk to my rear deck and everything is fine, so the short must be somwhere between the rear deck and the radio unit itself.