Ok, so i changed the water pump, new upper and lower hoses, new radiator, new fluid, but for someone the car is overheating AND only when i turn the A/C on. I have no idea why this is happening. I have been driving the entire California summer without A/C, just because within 5 minutes of me turning on the A/C the car will over heat.

I've checked the fans, and both are woking properly. The moment the A/Cis turned on, the fan kicks in and stays on, even while in idle.

Anyone have any idea why this is happening?
Wondering if this is a sign the A/C is about to fail?

 

BUMP

Nobody has an idea on this issue?

 

Any advance on this issue? I'm interested in the resolution

 

Only thing you haven't touched on is a leaking head gasket blowing exhaust into the coolant. Why just when A/C is on? I'm scratchin my head a bit but maybe the added load forces the leak. There are combustion test kits available at reasonable prices. May be able to sign one out from AutoZone or the like: http://www.amazon.com/s/ref=nb_sb_ss...n%2Caps%2C1409 Or.... look for bubbles with the rad cap off.

 

When the AC turns on there is an added load on the engine, so bad head gaskets, or a bad water pump could cause the overheating under load (aka AC on).

 

Hey, thanks for the confirmation. My head appreciates it.

 

I also considered the added load of AC and was initially thinking fan related, but then OP said fans were good and I was like "whelp, I'm out on this one"

 

Never thought it could be the head gasket. I have to change the oil pan gasket, so might as well include the head gasket. I'll keep you guys posted, and hopefully that's all it is.

 

Let us know what you find out, I'm very curious about this problem