Question about 1999 Jeep Grand Cherokee

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Jeep grand Cherokee 1999 engine coolant temperature gage problem

I have a Jeep Grand Cherokee 1999 and just recently I noticed that my engine coolant temperature gage will just drop from middle to low in the middle of a drive I don't know if it would have anything to do with heater core because as in one of the previous forums I also have a problem with my windshield fogging.If anyone knows what the problem could be please let me know.

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Please have your thermostat replaced first..cheapest option first.perhaps thermofan is kicking in at wrong time sensor?

Posted on Mar 03, 2009

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I have a 2002 Jeep Grand Cherokee. It gets very very hot and then stops running. Can you please tell me why


Have you checked the coolant level in the radiator and coolant recovery tank? If low, add until full level is reached. Other causes could be a malfunctioning water pump, slipping serpentine belt, or stuck thermostat. Do you have a temperature gage or just a warning light? When this happens and you stop the engine for a few minutes, are you able to restart an d keep going? If so, I'd look at the thermostat as the problem.

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Trace the upper radiator hose toward the Grand Cherokee's engine until you reach the metal component connecting the hose to the engine -- this is the thermostat housing. Find the coolant temperature sensor -- the electrical component on the thermostat housing. Press the locking button on the coolant temperature sensor wiring harness and pull the wiring harness from the sensor, then remove sensor it screws out. when putting in new sensor coat the threads with teflon pipe thread tape so there is no leaks.

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Could you tell me where the coolant temperature sensor is located at on an inline 6, 4.0L 2003 Jeep Grand Cherokee Laredo?


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Fig. The coolant temperature sensor is installed in the thermostat housing (click image for zoom).
  1. Partially drain cooling system until coolant level is below cylinder head.
  2. Disconnect coolant temperature sensor wire connector.
  3. Remove sensor from thermostat housing.
Hope helps (remember to rate ths answer).

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Not sure about your car, but alot of times the oil gauge sending unit is kinda close to the oil filter, and maybe during the oil change the wire connection was removed or damaged. Turn the key on and engine off ,and if the gauge reads 80psi then the sneding unit might be the problem

Mar 02, 2011 | 1999 Jeep Grand Cherokee

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This is a safety system built into a Grand cherokee. If it gets hot or loses oil pressure it will shut itself down to prevent engine damage. If it hasn't been started and it reads hot I would say your coolant temperature sensor for the gauge has gone bad and needs to be replaced. They are fairly inexpensive and not to hard to replace.

Oct 03, 2010 | 2000 Jeep Grand Cherokee

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