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I have a 2000 Mercury Sable OHV 3.0L V6 engine. I drive the car every day to work without turning the AC on and it does fine. As soon as I turn the AC on, it starts to over heat. I already changed the thermostat, and temperture switch. I suspect the next thing I have to change is the compressor. what else can it be.

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Your A/C Works, so its not the Compressor. Don't Ask, change the water pump and do also a pre-fllush, with a good Radiator Flush, and do a full flush-out of the cooling system that will take care of the entire Engine Block and water ways, in the process, look carefully at the Top and Bottom Hoses going to the Radiator, if swollen near the clamps or any part, change them in the Flush Process, and do not use water when filling-up, use a good pre-mix like Prestone and similar brand Coolant. I am pretty sure, it is the service it may have needed for the long haul again!
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Posted on Mar 22, 2013

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Is the fan runnung? Also could be the water pump. Running the A/C puts alot of extra strain on the motor.

Posted on Jun 24, 2009

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