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      10-19-2012, 02:06 PM   #1
d3l0n
I love the ///M3, but I want 550hp ///M5
 
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Engine overheat when AC is on?

Can someone help me figure this out? I don't have a great mechanic that I always go to. So, I'd like some assistance in figuring this out. I like to understand things to make the most efficient decision I guess.

When driving long distances at speeds over 60mph with out my AC on, I'm fine.

When I'm driving almost any variable distance with AC on, the engine seems to get hot. I pull over and coolant is pumping.


History: I have has AC issues in the past.


Do you guys think I just need a new thermostat? Or a water pump?

I was told last year I needed a new water pump.

How can I determine?

Any help is appreciated!
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