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Temp red lines with AC on - - Thermostat - sending unit or both? 200 1992

posted by  Birdfarmer on  Wed Jul 28 08:13 CST 2010
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last visit: Thu May 1 15:32 CST 2014
[RELATED]

Bought my daughter a 240 a couple of months back - since this is my first Volvo, I'm just starting to get familar with the way these things work.

Running the car, it shows nearly mid way on the temp guage - which I've read is somewhat normal with this car. But when I turned on the AC (and ran it here in the West TN heat of about 98 with 108 heat index) at about 75mph - and she nearly red lined on me. - - Needless to say, I WANT my AC!!

Didn't feel any loss of power, and frankly the heat from the engine compartment didn't feel what I would expect to be "red line hot".

Since I'm expecting that she's got the original thermostat (everthing else has been original) - should I change that first?? And if so should I go to an 87 instead of a 92?

Should I also look at changing the Sending unit since it may be falsely reading hot?

Or should I go the route of putting in a digital temp guage? If so, what are some suggestions for best look / performance?

Any and all input is appreciated.
Thanks
Charles






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