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General E46 Forum
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Old 12-04-2012, 10:20 PM   #1
doppelganger325
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Possible fan clutch failure?

Plz help me all!!! after doing a repair when my 325ci locked up an idler bearing, my car keeps overheating...this last time doing the coolant bleed it ran for at least 45 minutes at operating temp with some random holds at 2000 rpms. I was concerned that my electric fan in front of the radiator was bad but this time it came on, but only for short 15 second bursts or so...beginning, it had no hot air coming from the vents inside the car even though it was definitely at operating temp ( 12 o'clock on the temp guage). but it finally warmed up and help for at least another 25 or 35 minutes before overheating. i performed the newspaper fan clutch test numerous times after the car was up to temp and every time it stopped with the paper. Would a bad fan clutch that will not fully engage cause the overheating even if the auxillary fan still tries to engage? I have been checking all relavent posts that i could search for but have not come across anything that told me exactly what is going on, so if this has been addressed before, I apologize sincerely. When the car lost the idler pulley, belts jumped off, lost power steering, and alternator, and my coolant dumped out, I assume, from my reservoir. Trying to diagnose, I replaced a cracked reservoir, was going to replace the water pump, since it seemed that it was the culprit, but OEMBIMMERPARTS sent me the wrong parts. The numbers dont even match up...lol. But I think the pump is working good enough to not overheat at idle. So, my question is, can a failed fan clutch cause my problems? And why does the auxillary not compensate for the failure? Oh, my car is 325ci 2003 m54...and I also found a shattered transmission cooler thermostat, but i hear they are prone to failure. Running without that thermostat would not cause overheating from the engine would it? Well, thanks in advance for your time with this issue.
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Old 12-04-2012, 10:33 PM   #2
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Old 12-04-2012, 10:47 PM   #3
doppelganger325
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the car isnt throwing codes...its just getting up past and over operating temp
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Old 12-05-2012, 12:41 AM   #4
afstud
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Running without the trans therm will not cause any engine overheating... it only controls the coolant to the transmission, i ran my old e46 without one for a long time and had no problems.... your problem sounds like a bad fan clutch
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Old 12-05-2012, 07:45 AM   #5
SpoonerDee
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My fan clutch was toast on my e46 when I bought it and it never overheated. Had no idea it was bad for like the first year I owned it.

Last edited by SpoonerDee; 12-05-2012 at 07:46 AM.
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Old 12-05-2012, 09:44 AM   #6
BimmersGarage
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What parts have you replaced exactly?
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Old 12-05-2012, 11:17 AM   #7
doppelganger325
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I replaced the water pump, tstat(main), tank, and some pulleys..I can't afford to replace the complete system...

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Old 12-05-2012, 12:29 PM   #8
stevenluczynski
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Quote:
Originally Posted by doppelganger325 View Post
I replaced the water pump, tstat(main), tank, and some pulleys..I can't afford to replace the complete system...

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Sounds like you should sell your car and pick up so cheaper to maintain
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Old 12-05-2012, 12:44 PM   #9
EmFiftyFour
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Try to make your posts shorter and get straight to the point.

Now the general rule of thumb is if you spin the fan by hand and it has no resistance and makes more then half a turn, chances are it's no good. You could be overheating for other reasons as well. Thermostat, water pump, still air in the system. I found it can be quite a bitch to bleed these cars. At least my car is like that.
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Old 12-05-2012, 01:09 PM   #10
doppelganger325
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Lol ok will do that was my very first post and I wanted to make sure I covered everything...Thanx all, I'm trying to locate a fan clutch currently...I'll keep you informed

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