ok, i have a problem.. I have an 87 and my A/C pump is locked up. Or at least i think so, I can start my car.. but if i have my fan on and i push in the A/C button i hear this squealing/grinding sort of noise then i stall. so i'm thinking that the pump is locked up, not allowing it to spin when engaged therefor stalling the engine. am i right? or am i totally off track with this problem lol. 2nd, say its really cold outside and i have the heat on, and the defroster.. and my window starts fogging up, is it ok to turn the A/C on to dry the air while i have the heat on? or is that a bad thing.. i know you are supposed to do that on newer cars but is it ok on older ones? thanks.