1988 Cadillac Seville Cooling Fan failure

CPOWDER

MEMBER
1988 CADILLAC SEVILLE
V8
FWD
AUTOMATIC
19,000 MILES

I've just recently start haveing a problem with my cooling fan coming on when needed. It will come on when I first start the car an after I let the car idle for about 25minutes an the temp has went up to 195degrees an back down a few times the fan cuts off an then it will come back on but it runs very slow with the temp riseing to around 222 an 224 degrees. I changed the fan relay an I don't know if its a bad sending unit or faulty ECM. Please help.

Friday, March 7th, 2008 AT 11:15 AM

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

You might want to test the coolant temperature sensor-I've looked for a temperature sender there's none-the computer reads it and therefore energizes the the fan relay.

Might also want to replace the thermostat-it controls the engine temperature then the coolant temperature sensor sense it and reports the temperature to the computer to activate the relay and to the fan motor

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Sunday, March 9th, 2008 AT 5:36 PM