hey guys...i have an 87 RS...there are not really any problems with it except ONE...the motor squeaks...we bought a new alternator, belt tensioner, and a new serpentine belt to try to fix this...when we run the car without the belt on...the squeak stops...it has air conditioning so we figure the problem might be the waterpump, the powersteering pump, or the AC, the car doesnt make a different noise when i steer, and when i turn on the AC....so i dont know what to do next...thanks for your help

 

bad idler bearing?