Sometimes there is a fan that is installed in units to keep them cool. Your system literally has a heat stroke when this fan isnt working. Your system is also sometimes cooled by the A/C ducting at the back of wiring. You will have to check whther or not you have a fan in your system, either by instruction manaul or website. If fan isnt working, take it to electronics specialist, cause all are different and I won't be able to walk you through it.
**Working PART-TIME for Carjunky for a while, Please bare with me =)**