Fan does not turn on when A/C is on.

btrinh · 07-13-2013, 02:46 AM

Hello, I tried searching but it doesn't quite answer my problem. I have a 97 318ti and the fan does not turn on when I turn on the A/C. The clutch engages and air comes out of the vents, but the fan on the radiator does not turn on. I jumped the wires where the sensor is on the radiator and the high speed fan comes on but the low speed does not. Is this in any way related? Any help would be appreciated.

**BlackBMWs** · 07-13-2013, 09:32 PM

Quote:

Originally Posted by btrinh

Hello, I tried searching but it doesn't quite answer my problem. I have a 97 318ti and the fan does not turn on when I turn on the A/C. The clutch engages and air comes out of the vents, but the fan on the radiator does not turn on. I jumped the wires where the sensor is on the radiator and the high speed fan comes on but the low speed does not. Is this in any way related? Any help would be appreciated.

Check the fan relay in the fuse box. They do fail. Not near my TI's just now, but I do recall they were one of two purple relays I think in the fuse box. Search the forum as other folks have asked and commented on this very topic.

btrinh · 07-13-2013, 09:52 PM

Quote:

Originally Posted by BlackBMWs

Check the fan relay in the fuse box. They do fail. Not near my TI's just now, but I do recall they were one of two purple relays I think in the fuse box. Search the forum as other folks have asked and commented on this very topic.

Thank you! I pulled and cleaned some of the relay terminals and fuses and it works now. Just need to replace the HS relay.

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