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09-22-2008, 10:05 PM
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#1
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3rd Gear Member
Join Date: Dec 2003
Location: Port Credit
Posts: 559
Car: finally Bimmerless!
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Engine overheats ... how to check if the clutch fan works?
Bentley says that with the engine cold and off, you should be able to spin the fan with slight resistance. Nothing else. How do I know it works or doesn't? Any other tests to sort it out?
What is a common issue with M20s overheating??? Trying to get my 325is on the road and ready for Bimmercruise.
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09-22-2008, 10:13 PM
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#2
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6th Gear Member
Join Date: May 2007
Location: Brampton
Posts: 2,938
Car: 1990 BMW 328i OBD1
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just keep your heater on 
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***E30 part out to come. Gimme a PM for any inquiries!***
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09-22-2008, 10:16 PM
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#3
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16/F/Cali
Join Date: Dec 2006
Location: OJ Didn't Do it.
Posts: 1,301
Car: E34 530i/5
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clutch fan, or fan clutch?
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95 530i|Modifications - Work.
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09-22-2008, 11:02 PM
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#4
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3rd Gear Member
Join Date: Dec 2003
Location: Port Credit
Posts: 559
Car: finally Bimmerless!
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Quote:
Originally Posted by makaveli2k
clutch fan, or fan clutch?
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OK ... like I mentioned before, I want to know how to check it! 
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09-22-2008, 11:07 PM
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#5
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16/F/Cali
Join Date: Dec 2006
Location: OJ Didn't Do it.
Posts: 1,301
Car: E34 530i/5
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Take it for a spin, when you're at idle the car will over heat, than when you get up to speed it should cool down. That's one way to check it out.
Beware though, if you walk into a parts source and you have a clueless attendant helping you, If you say clutch fan instead of fan clutch you'll get a totally different part.
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95 530i|Modifications - Work.
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09-23-2008, 12:10 AM
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#6
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6th Gear Member
Join Date: Mar 2004
Location: Toronto
Posts: 3,035
Car: E36 turbo
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I don't think M20's have an overheating issue... mine and every other one I've ever seen runs below the half mark on the temp gauge..
Are you sure it's the fan? Does your car only overheat while idling/standing?
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09-23-2008, 12:44 AM
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#7
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Over 9 F**KING THOUSAND!!
Join Date: May 2004
Location: Oakville
Posts: 9,646
Car: '91 325iS | '96 332i
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Quote:
Originally Posted by TopSpeed
Bentley says that with the engine cold and off, you should be able to spin the fan with slight resistance. Nothing else. How do I know it works or doesn't? Any other tests to sort it out?
What is a common issue with M20s overheating??? Trying to get my 325is on the road and ready for Bimmercruise.
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Try the same thing, only shut the car off when it gets to operating temp, and see if the fan spins freely. It should have significant resistance if it's working right.
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S52|ZF|TRM Coilovers 670/895|Staggered 18" 5's
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09-23-2008, 08:17 AM
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#8
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if I lived . I would be ~
Join Date: Mar 2004
Location: Ottawa
Posts: 5,802
Car: e30 with e91 beater
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I've never tried this, but I've read about the newspaper shred test.. Start the car and roll up a newspaper. Stick it into the turning fan. If the clutch is engaging enough to cool the car it should shred the paper. If you can stop the fan with the paper; new fan clutch time.
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09-23-2008, 01:59 PM
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#9
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Moderator
Join Date: Jan 2002
Location: Toronto
Posts: 2,142
Car: 1987 325is
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Quote:
Originally Posted by everlast
I've never tried this, but I've read about the newspaper shred test.. Start the car and roll up a newspaper. Stick it into the turning fan. If the clutch is engaging enough to cool the car it should shred the paper. If you can stop the fan with the paper; new fan clutch time.
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Just make sure that the car is warmed up first.
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09-23-2008, 06:28 PM
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#10
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3rd Gear Member
Join Date: Dec 2003
Location: Port Credit
Posts: 559
Car: finally Bimmerless!
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I think it is the fan; spins with slight resistance when cold but without ANY resistance (freewheels) when hot!
Anyone have a good one I can buy?
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09-23-2008, 08:04 PM
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#11
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if I lived . I would be ~
Join Date: Mar 2004
Location: Ottawa
Posts: 5,802
Car: e30 with e91 beater
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Good find! I just bought one on ebay... they pop up now and again, or you can buy the clutch itself for about $60.
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09-30-2008, 08:40 PM
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#12
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2nd Gear Member
Join Date: Sep 2007
Location: T.O
Posts: 174
Car: EJ
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As mentioned before, if it overheats at idle fan issues. You can jump the AC fan if you're in traffic. Look at the diagram and jump two wires of the temp switch on the right side of the rad. I don't remember the exact colors. One of them is ground and the other two are low and high speed ac fan
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10-01-2008, 12:08 PM
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#13
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4th Gear Member
Join Date: May 2006
Location: Mississauga
Posts: 833
Car: Mississauga Transit
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Just buy a new one, they are about $60 at Parts Source.
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10-01-2008, 12:54 PM
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#14
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4th Gear Member
Join Date: Jun 2006
Location: whitby
Posts: 669
Car: 2 e36's
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check your thermostat.
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10-01-2008, 06:21 PM
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#15
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3rd Gear Member
Join Date: Dec 2003
Location: Port Credit
Posts: 559
Car: finally Bimmerless!
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Quote:
Originally Posted by dgmorr
Just buy a new one, they are about $60 at Parts Source.
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Actually about $130 when I called and they are special order not-returnable.
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