Question about 2001 Jeep Grand Cherokee

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Our jeep suddenly overheated,it went to hot on the temp guage, I'm assuming 260o F. It blew cool air while it was over heated and then off and on, warm to hot air.I think possibly it needs the thermostat changed, but I am not seeing the usual round thermostat housing where the thermostat should be located. It is a 4.7 L, V-8, engine.

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Check the cooling system for leaks...when the heat goes cold like yours did it usually is caused by the coolant level being so far below normal that it won't flow through the heater core. A blown head gasket can also drive coolant out of the system but I's check for leaks first as that is most common. You also need to make sure the fans are operating correctly.
You should change the thermostat after any overheat, as once they are run hot they become unreliable. Since manufacturers have started playing a new game of "hide the stuff you need to work on" It might not be at the engine end of the upper hose where it always was. Take a peek at a chiltons or haynes manual and you can find out where yours is.

Posted on Sep 26, 2009

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