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2000 jeep grand cherokee laredo wanting to overheat

by azjeepgirl / October 25, 2012 12:26 PM PDT

Wants to overheat and go into the "red zone" but as long as I keep the heater on high/defrost and go above 35 mph, it seems to stay just past the line before the red zone. If I'm going slow then it creeps towards the red-zone but as soon as I'm going fast again it seems to cool off.

I've had the transmission flushed, the radiator flushed, put in new thermostat & gasket, new water pump, upper & lower radiator hoses, temperature sensor gauge and fan clutch.

No water in the oil or smoke out of tailpipe. Could it be a cracked head or ...?

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All Answers

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Hope this helps
by rayzor20 / November 13, 2012 9:38 PM PST

It is very interesting that everything has been replaced except for your radiator fan and the relay that controls the fan unit.
A mechanics shop should be able to tell you if your fan is working by using a 6 volt latern battery and some speaker cable.
If the fan works then it is your relay that controls the fan that might have died. Link below

I replaced both in my jeep and overheating disappeared. Bought the repalcement fan from Ebay and fan relay from Oreilly's.

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by azjeepgirl / November 14, 2012 2:44 AM PST
In reply to: Hope this helps

I will try that.

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