ok guys looked around already but didn't find anything similar to my problem. well my car is very slugish when i turn my A/C on (i know thats pretty common). thats not the problem, well it could be but anyways yea when im driving at high way speeds my car starts to over heat if i have my A/C on. i have to turn off my a/c and turn on my heat to get the engine temp back to normal. does anyone know why it would be over heating when i have my A/C on???? oh yea it only happens at high way speeds.

 

bump.

 

sounds like a blown headgasket or bad water pump.