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1990 Jeep Cherokee Engine Overheating

Tiny
JMSTAUFFER
  • MEMBER
  • 1990 JEEP CHEROKEE
Engine Cooling problem
1990 Jeep Cherokee 4 cyl Four Wheel Drive Automatic

What controls the engine overheating. Is it the thermostat, the coolant fan temp switch or the fan switch. I am going to replace the thermostat, but I dont know if that will fix the problem of the fan not turning on when engine is getting to hot. If I need to replace either ther coolant fan temp switch or fan switch were are they located
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Thursday, September 24th, 2009 AT 7:54 PM

1 Reply

Tiny
JEEPFAN
  • MECHANIC
  • 135 POSTS
The best thing to do before replacing anything would be to start your car let it reach normal operating temperature (about middle on the gauge) raise the hood and squeeze the upper radiator hose if when you release it you feel coolant surge through the hose your thermostat is working if the hose has no pressure and is cool to the touch the thermostat is not working.
If you find that the thermostat is working watch the temperature do not let the car overheat watch the cooling fan to see if it comes on. If the temperature rises close to the red area on gauge turn engine off and start checking the fan
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Friday, September 25th, 2009 AT 12:12 AM

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