98 Cavalier radiator fan - Third Generation Forum

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98 Cavalier radiator fan
Friday, March 13, 2015 11:34 AM
Only had this car for 6 weeks and it's been pretty cold here so I didn't notice this problem until a few days ago when it warmed up. Sitting in traffic the temp started rising although it never actually hit the red, nor did I overheat with steam etc. I connected my OBDII reader and the temp reached about 225 but no higher, though I'm afraid when spring actually arrives it might overheat.

I have checked and I have enough coolant, no apparent leaks. What I did notice is that the electric radiator fan is not coming on as it should. It won't come on when AC is on either at any temperature. I have checked the obvious things like the fuse and the relay (swapped it with known working AC blower relay) and it still doesn't work.

I was thinking that my ECT sensor is probably ok because the fan doesn't work with the AC on and I get a reading via OBDII. With the AC on, I removed the fan relay and tried removing/reinserting it a few times to see if I could hear/feel it click (verifying that it is trying to work the fan) but I get nothing. Makes me think the ECU is not commanding the fan to work like it should?

Any ideas?

Re: 98 Cavalier radiator fan
Sunday, March 15, 2015 7:57 PM
With the car running, unplug the connector on the coolant temperature sensor, near the upper radiator hose outlet. The fan should come on in 3 to 5 seconds if all else is working. This will likely also trigger the CEL, but that will go out when you reconnect the connector.

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Pete's Place
Re: 98 Cavalier radiator fan
Sunday, March 22, 2015 4:54 PM
I had to replace the fan motor on my '01 Z24.
In coolish weather it ran fine, but when I turned on the AC (to fix it) as soon as I noticed any heat in the condenser, the engine overheated and blew the coolant cap out of the reservoir.

That's how I found out I had a bad fan motor.
Ebay has 'em for cheap if you want Chinese.
I paid about $45 for a made in Canada motor.
Re: 98 Cavalier radiator fan
Tuesday, March 24, 2015 9:37 AM
From the factory fan is programed to come on at 223/224 degrees. So is it coming on at the 225 degrees?

FU Tuning

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