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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I had a problem with the fan it didnt turn on so my car over heated i changed the thermostat cuzit was broken then i hooked up the fan direct to my battery then i go to start my car and it cranks but wont...


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Hi!!

Apply 12v current straight to fan from battery to test fan motor, if it starts, then check the coolant temp. sensor, usually on or near thermostat housing. Also check for broken wires and loose connections.

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

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I NEED DIRECTIONS ON HOW TO REPLACE MY WATER PUMP


Remove or Disconnect
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  2. Multiple ribbed drive belt.
  3. Upper fan shroud.
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  6. Radiator outlet hose clamp and hose.
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Important
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Install or Connect
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Tighten
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  4. Multiple ribbed drive belt.
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