2000 Mercury Sable Overheating

Tiny
RIVERA19
  • MEMBER
  • 2000 MERCURY SABLE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 114,000 MILES
I have a 2000 Mercury Sable with a 3.0 OHV engine. When I turn the AC on, the temperature gauge gradually rises to almost touching the red bar. So I turn off the AC immediately and the temperature bar steadily decreases in temperature. I consulted several mechanics and I keep getting different answers. Some are telling me that the thermostat has gone bad. Some are telling me that the Temperature Switch needs to be changed. Some are telling me that maybe the waterpump is failing. Some are even saying that the radiator needs to be replaced. Now I do not want to spend money on unneeded parts. My thinking is that the compressor needs to be replaced because the car runs fine without over heating when I dont turn the AC on. Also, the car does well in the city with the AC on. It doesn't overheat until I reach the higher RPM on the highway. The car starts heating and the AC starts blowing warm air. What do you suggest?
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Wednesday, June 17th, 2009 AT 5:12 PM

2 Replies

Tiny
PHILSABLE
  • MEMBER
Did anyone respond to your question or did you ever resolve the issue with your Sable overheating?

I have a 2000 model which is doing exactly what you desribed. The radiator fan is running when the a/c comes on, the coolant resevoir is full, etc, etc.

Thanks for any response.
Philnangel@aol. Com
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Tuesday, August 25th, 2009 AT 9:58 AM
Tiny
DOCFIXIT
  • EXPERT
Got to go with radiator blockage in bottom due to calcification.
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Tuesday, August 25th, 2009 AT 10:16 AM

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