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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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Old 02-02-2016, 07:17 AM
Eddie6967 Eddie6967 is offline
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Location: Crestwood
Join Date: Oct 2015
Posts: 14
Mein Auto: 2003 BMW 325i
Radiotar Fan Help!

Alright well my 03 325i likes to overheat as you can tell from other posts of mine. So people told me to see if my fan works. So i let the car idle till it got to running temperature. The temperature started going up and the fan never kicked on. So i tested it i took 2 wires connected one to my postive and the other to my negative terminal and then i put the wire in the plug for the fan. So i was giving the fan direct power and the fan turned on with out a problem but it doesnt work when i plug the harness back in. Is there like a relay for the fan that can be bad? Any ideas?
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Old 02-02-2016, 08:50 AM
BaliDawg BaliDawg is offline
Code/Grease Monkey
Location: Riverside, CA
Join Date: Aug 2014
Posts: 34
Mein Auto: 325Ci 530i 750iL
Yep, it's not a relay per se, but more of a controller module mounted to the pusher fan assembly. It cannot be purchased by itself unless you get a used one. Most people replace the entire fan assembly. The part number is 64546988913.

There are several sensors that provide input to the DME which controls the pusher fan. But they are much more reliable than that fan controller module.

Last edited by BaliDawg; 02-02-2016 at 08:57 AM.
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Old 02-03-2016, 07:06 AM
marcozandrini marcozandrini is online now
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Join Date: Feb 2014
Posts: 1,488
Mein Auto:
Are you saying that the fan isn't getting 12VDC? There's a fuse for the fan. Check the fuse card in the fuse box. As I remember, the fuse is 50 amp. If you're saying there is power at the connector but the fan doesn't come on check the temperature sensor in the lower radiator hose. The signal from that sensor is used by the engine computer (ECU) to determine when to turn the fan on. That sensor is not the sensor that tells the ECU the engine temperature. That sensor is in the rear of the engine.
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