Question about 2001 Jeep Grand Cherokee

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The tempature goes up in minutes I usually shut the a/c off the temp corrects itself why?

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I'm going to assume your coolant level is full and you have the proper 50/50 mix in there. The antifreeze concentration will not change the coolant temp but will prevent it from boiling over...same applies to the correct pressure cap on the system The A/C draws horsepower from the engine. When it's on, it makes the engine work harder, so it produces more heat. To compensate for the additional heat, you either have an electric radiator fan that should come on with the A/C or the computer will adjust the engine timing (sometimes both). You also have a temperature sensitive fan coupler that is part of the mechanical fan. As temperature rises, that causes the fan to lock and provide maximum cooling.
You said that the temp goes up....a slight rise in temp with the A/C on is normal providing that the engine does not overheat (boil over).
To provide max cooling (heat transfer) make sure that the thermostat is fully opening (should be a 195(f)) T stats are inexpensive so testing is pretty much a waste of time. Far easier to just replace it. Make sure that the radiator is not externally blocked (leaves bugs etc. on the A/C condenser or between the condenser and radiator) and that the radiator is not internally obstructed (calcium deposits partially plugging core) Jeep radiators are marginally undersized and are therefore very sensitive to obstructions as they don't have any room for error when it comes to being partially blocked for any reason.
To begin, I'd replace the T stat but keep in mind that other items I've mentioned may have a lot to do with your problem as well.

Posted on Jul 08, 2010

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