Question about 2002 Jeep Grand Cherokee

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Coolant fan will not come on, Fan motor OK

What should I start replacing first, Fan motor OK when direct currant applied

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First thing is you need to look in the computer to see if it sees the temp get to approx 225 degrees. without this infor you wont know if the computer failed A bidirectional scanner can turn the relay on for the fan. If the relay does not click when commanded then you replace the relay. If it still does not click then you replace the computer once you determine you have no wiring issues. If the computer temp never gets to 225 then you have a stuck open thermostat or a bad temp sensor.

Posted on Apr 30, 2010

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Check the switch that triggers the fan, when the car is hot the switch should be closed (passing current). This would be my #1 suspect.

Posted on Apr 30, 2010


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Good Luck!! Don't forget to change this post!!

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Remove or Disconnect
  1. Coolant from the radiator.
  2. Multiple ribbed drive belt.
  3. Upper fan shroud.
  4. Fan and fan clutch assembly.
  5. Coolant pump pulley.
  6. Radiator outlet hose clamp and hose.
  7. Bolts and stud.
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  9. Gasket(s). Inspect
    • All parts and replace as necessary.
  • Be sure all mating surfaces are free of burrs or other imperfections.
Install or Connect
  1. Gasket(s) in place.
  2. Coolant pump.
  3. Bolts and stud.
    • Sealant (GM P/N 1052080 or equivalent) must be applied to the bolt threads.
  • Bolts and stud to 41 N.m (30 ft. lbs.) , 4.3 engines.
  1. Radiator outlet hose and clamp.
  2. Coolant pump pulley.
  3. Fan and fan clutch assembly.
  4. Multiple ribbed drive belt.
  5. Upper fan shroud.
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