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Old 12-20-2004, 03:54 PM   #1
ebeck
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Default Radiator fan not coming on. So it seems.

The fan on the driver side does not appear to come on. Even when hot. The passanger fan comes on with the AC. Is there a way to test if there is a bad relay or something on the driver soide fan? Perhaps a diagnostic mode or something? Seems like the fan should come on and stay on even after the car has stopped if the engine is hot.
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Old 12-20-2004, 04:07 PM   #2
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You can swap the relays for the fans, they are identical. See if the problem follows the relays or not. Both fans should run with the AC.
Is that fan any harder to turn than the other one or does it spin easily?
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Old 12-20-2004, 04:11 PM   #3
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No, it spins real easily. Motor seems fins. Seems like there is just no current. Relays are in the engine compartment fuse box?

Oh, I had a thought, if I turn the key to accessory and turn the cockpit fan swithc to 1 and engage the AC compressor, the fans are supposed to come on. Is this BOTH fans or just the passanger fan?
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Old 12-20-2004, 04:17 PM   #4
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I'm not sure the fans and compressor will engage with the key off. Remember the AC switch is connected to the ECU, not directly to the compressor. The engine may need to be running.
Yes the relays are in the underhood box. Should be labeled, look on the inside of the cover.
You can also try physically swapping the fans and plugging each into the other's connector. They are not fully interchangeable and you won't be able to actually mount them in the opposite positions, but for testing purposes you can do this as long as the connectors will reach the harnesses.
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Old 12-20-2004, 04:17 PM   #5
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Both fans should come on when you turn the AC on. The key needs to be in the "ON" position for you to test it though.
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Old 12-20-2004, 04:55 PM   #6
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Yeah I was referencing this thread. http://forums.nasioc.com/forums/show...t=radiator+fan post #2.

With out my car I am not sure what run and on are. I will check at lunch. So both fans should come on. If not I will swithc relays and try again. I will let you know.....
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Old 12-20-2004, 07:44 PM   #7
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OK. Both fans come on with this test. So if the fans do not come on when hot, must be the thermostat that is the problem?
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Old 12-20-2004, 07:56 PM   #8
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The fan motors have dual windings, for low and high speed. There is a relay for each winding. It's possible that one of the relays for that fan is NG, or one of the windings is burned out and the other one is ok, so the fan will run at one speed but not the other.
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Old 12-20-2004, 08:13 PM   #9
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Which is more likley, bad realy or bad thermostat? Maybe I shoudl just swap em both.....
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Old 12-20-2004, 08:22 PM   #10
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It's not the thermostat. The fans are controlled by the ECU based on inputs from the coolant temp sensor, AC switch etc. Swap all the relays around and see if the problem moves, try swapping the fans as I suggested. You can also take the fans out and check the windings with an ohmeter to see if one is open. The readings should be the same for both fans.
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Old 12-20-2004, 08:31 PM   #11
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Ah! I assumed it was thermostat controlled. Thanks. Perhaps coolant temp sensor is bad.

I will swap relays. Kinda hard to make car hot ijn winter weather and bid PWR radiator. I'll see what I can do.
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Old 12-20-2004, 08:35 PM   #12
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A bad coolant temp sensor would cause other problems and likely set a CEL.
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Old 12-20-2004, 09:12 PM   #13
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As mulder has pointed out. It's more then likely either a single relay or one of the windings in the motor.
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Old 12-21-2004, 01:24 AM   #14
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Thanks guys. I am gonna just replace both relays and the fan. I have spares.
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Old 12-21-2004, 10:34 AM   #15
Legacy777
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Only problem with that is you don't know what the actual problem was. Why not just test/swap each relay individually, and if need be, swap out each fan to figure out what exactly is the problem.

Wouldn't it be nice to know what the problem is, rather then just say, oh must be one of those things.
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Old 12-21-2004, 12:40 PM   #16
ebeck
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Swapped both relays both fans work. Not sure how to make car overheat. That is what is needed to test it.
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