I've been searching, but can't find anything really related to my problem. I have a 93 ES and the OEM car stereo is now only working when the car is warm. It won't come on in the mornings after being parked, or at night once the temperature outside has dropped (below 70). It only works during the day or after long drives in colder weather. Anyone have an idea what would be going on?

 

Sounds like a moisture problem to me. I can't say that I have had this problem in a car before, but coming from an electronics background I would open the radio up and check for moisture.

Otherwise it could be a wiring issue, but I wouldn't have a clue where to start.