Question about 1992 Buick Roadmaster

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My temp goes up when my car is idle and the ac on

My temp goes up when my car is idle with the ac on... I changed the thermastat, water pump, top and bottom hose that connect to the radiator..

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If the temperature goes up when the ac is on, then there may be a problem with the circulation of coolant throughout the system. You said you changed the thermostat which is good. But, did you backflush the engine's cooling system so that maximum flow can be achieved?

On the other hand, the heat that comes off of the condenser can cause the radiator to cool less efficiently on hot days.

Does the fan immediately go on when the a/c is turned on? or is it the older style fan belt driven fan? Even, so, if it's an older style fan, the clutch sometimes go bad in them so that the fan doesn't spin as efficiently as it should.

Also, did you use 50/50 Antifreeze to water ratio coolant mixture?
If you use pure Antifreeze 100% concentration, then it can cause an overheat condition, because the fluid at this concentration doesn't transfer heat as well as a 50/50 solution of antifreeze to water.

Good luck fixing this problem.

Posted on Jul 20, 2010

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I don't think you do any thing wrong. I suspect the coolant temperature has a loosed connection, or it is bad. If you are certain that your coolant temperature sensor is good then remove the thermostat to run for 2 days to see the temp reading gauge is normal then buy a new one to put it back. Good Luck.

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