Question about 1996 Jeep Grand Cherokee

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Jeep overheating with a new radiator!

Overheats- have replaced radiator and thermostate and flushed all the hoses

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  • Mike Butler
    Mike Butler May 11, 2010

    Electric or mechanical fan on that? Did you let it run for quite a while with rad cap off & with heater on while filling system?



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I had a 1998 Dodge Ram that Overheated alot. I changed the Radiators and Thermostats a couple of times. I finally pulled the water pump and found the impellers had been eaten away by electrolysis. I am not saying this is your problem but it is worth a shot. You can check for electrolysis with a voltmeter put one probe on the negative battery terminal and the other in the coolant. You want a reading of less than 0.2 volts.

Posted on Jul 05, 2009

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The 4.0 has two cooling fans, 1 belt driven and one electric. If you determine the water pump is circulating the coolant and it is still overheating, observe the electric cooling fan for operation. It can be activated by turning on the A/C and also will come on when the temperature of the coolant reaches its setting. If the electric fan is not coming on when the engine gets warm you are only cooling 1/2 of the surface area of the radiator. Unplug the fan and run wires from your battery to the fan and check if it comes on. If it does not, then you need a new electric fan. If the fan comes on with direct wiring from the battery, check the fan relay switch located under the hood, it could be bad.

All of this is assuming you are not losing coolant from any source including the headgasket.

Posted on Jul 04, 2009

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Check water pump

Posted on Jul 04, 2009

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2. The radiator fan may not be spinning. The motor may be disconnected or burned-out.

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