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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.
Depend what Engine Model you have: 2001 - 2004 (WG) Grand Cherokee (International Markets) 1999 - 2004 (WJ) Grand Cherokee (All Markets) WJ engine Specifications 4.0L I-6 1-5-3-6-2-4 4.7L V8 1-8-4-3-6-5-7-2 4.7L V8 HO 1-8-4-3-6-5-7-2
There is the coolant sensor that tells the computer the temp,and the computer sends a signal to the cooling fan relays,and the relay turns the cooling fans on,and off,if the system is low on coolant,or has air in the cooling system,then the cooling fans would not come on,or the sensor is bad,if this was at all helpful,please rate,thank you.
in the 5.2L V8 engine the coolant sensor is located on top of the engine. Locate the coolant thick hose coming from top of the ratiator to the top of the engine. Look at the place such hose connects to the engine you wont miss the sensor it is about one inch from there.
I think it is related to the cooling system, still having air in it. Make sure the heater is running/on when your running the engine. Could be a faulty ECT sensor (engine coolant temp.) but proof it out. proof it out, remove the sensor and see if there is air behind it and see if the sensor is within parameters.
The coolant sensor that give feed back to the temp. gauge on the dash.
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