radio problem and fles fan

just purchased 97 s-10 LT blazer 76k great vehicle so far. radio problem. both rear door speakers don't work other 4 speakers are fine any suggestions before i tear into the dash or the doors? am/fm/cd. has anybody ever used a flex fan to replace stock fan either fiberglass or stainless steel? i had on my 1971 scout II as always "anything else is just a car" i guess a blazer is the next best choice!!!!

Before you go into the doors, check ur fuse on the radio. if not there might be a pinch somewhere in the doors or dash. Thats all I can think of..

the door speaker are probaly shot or they are just diconected