OverHeat Problem on 98 Vic

Hey yea New To The Forum, But Got A question. my car runs fine, but if u turn on my A/C or Max A/C, or Defrost, my Vic starts to overheat. Cant figure out what the problem is. My fan runs at both speeds. i have flushed the system twice comes cleans. A/C Pully works fine. replace thermostat twice, now i aint running one. I have asked over 30 shops and none have been able to tell me a what it could be. If anyone can help me out that would be awsome..Thanks Rob

Im sure you no not to let it get to hot, being that our motors are aluminum and they will destroy your head gaskets, i think somebody had the same problem as you, It could be the either the a/c comp or your putting a strain on the motor.