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318 overheating in traffic
BMW BMW General Discussions (alt.autos.bmw)
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#11
 
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Re: 318 overheating in traffic -
03-20-2007
, 04:38 AM
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And this is auxiliary fan. Since temperature is OK on highway driving I suspect that the main (mechanically driven in E30) fan does not operate as it should. Perhaps the fan clutch is broken? |
Quote:
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DING DING DING We have a winner. The Fan Clutch is broken. |
- the fan noise increases.
--
*Speak softly and carry a cellular phone *
Dave Plowman dave (AT) davenoise (DOT) co.uk London SW
To e-mail, change noise into sound.
#12
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Not quite true Jeff. The viscous coupling is there to prevent the fan running at engine speed - It is designed to limit the speed of the fan. It will actually draw far more air at idle - mid range than pro-rata at high revs. If it ever were to run at top belt speed it would actually rip out the radiator fins. |
this type by the clock spring on the back which sort of measures the air
temperature being drawn through the rad and varies the drive. And when
they get hot they do near as dammit lock up. I've had one fail locked
solid and the noise was no greater than when it locked when hot.
If you have one on the bench you can check this operation with a hot air
gun (paint stripper).
--
*Stable Relationships Are For Horses. *
Dave Plowman dave (AT) davenoise (DOT) co.uk London SW
To e-mail, change noise into sound.
#13
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On Tue, 20 Mar 2007 09:40:01 +0200, "MW de Jager" mwdejager (AT) privatemail (DOT) me.uk wrote: Thanks for everyone's replies, but I'm still no wiser. My E36 328 has the mechanical fan with clutch that runs off the engine belt. The E36 318i South African built with Single OHC, does not have an engine driven fan, at least my wife's does not. It only has an electric fan which I supect is called the auxilliary fan. In the fuse box, it states that the 1996 4 cylinder models have fuse no 48 for the aux fan. This fuse however is supposed to be underneath the steering wheel and apart from one gazillion wires and wire connections I cannot find a fuse there. :-( There a 3 wires coming from a device sitting on the side of the radiator, which I presume is a temp sensor of some kind. These wires have been stripped by someone before, I don't know why. The red LED on the temp guage comes on fine, so why would the aux fan not start running soon enough? The fan runs fine when the AC is on though. Any suggestions IFRC all the BMWs have mechanical (viscous or even thermo-clutch pre 1978) fans fitted. It is very likely that some previous owner did away with it considering the fact he lived in the middle of nowhere so town driving didn't;come into his repertoire! Lets have the last 7 digits of the chassis number (OFF LIST if you prefer) and I see if the vehicle ever had a mechanical/viscous fan fitted. Sir Hugh of Bognor The difference between men and boys is the price of their toys. Intelligence is not knowing the answer but knowing where and how to find it! Hugh Gundersen hsg (AT) h-gee (DOT) co.uk Bognor Regis, W.Sussex, England, UK |
#14
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Last 7 digits of VIN AV70871 Thanks in advance MW |
You should have one:
http://www.realoem.com/bmw/showparts...& hg=11&fg=35
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___ ____
/__/ / \ ** Registrovani korisnik Linuksa #291606 **
/ / \/ /\ \ ** Registered Linux user #291606 **
/__/\____/--\__\ ** http://counter.li.org/ **
#15
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On Mon, 19 Mar 2007 17:09:34 GMT, "Jeff Strickland" <c... (AT) verizon (DOT) net> wrote: DING DING DING We have a winner. The Fan Clutch is broken. What did I say first off.................... |
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C.R. Krieger
(Been there; done that)
#16
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Nedavno MW de Jager napisa: Last 7 digits of VIN AV70871 Thanks in advance MW You should have one: http://www.realoem.com/bmw/showparts...& hg=11&fg=35 |
I already sent him a picture with part numbers..........
Sir Hugh of Bognor
The difference between men and boys is the price of their toys.
Intelligence is not knowing the answer but knowing where and how to find it!
Hugh Gundersen
hsg (AT) h-gee (DOT) co.uk
Bognor Regis, W.Sussex, England, UK
#17
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I think your fan clutch is failing. You have a fan tht is driven by the fan belts on the front of the engine. There is a clutch (viscous coupling) that is supposed to lock up as the temp rises. When the clutch locks up, the fan is physically driven by the belts, the rest of the time, the fan can easily be stopped from rotating, and slow speeds (idle speeds, not traffic speeds), the fan might not even spin at all. Should the fan spin slowly, or not at all -- even worse -- the engine will over heat. This condition will right itself when traffic speeds go back up. What happens then is that the air flow over the radiator take splace because the car is moving, but in stop-n-go traffic, the air flow is caused by the fan that has stopped working. |
+1.
Sounds exactly like the viscous fan clutch has gone tits up. It's a
fairly easy do it yerself. You just need to know it threads onto the
waterpump backwards (CCW = on, CW = off). Once you find a wrench to fit
the big nut, rap the end of the wrench (in the aforementioned direction)
it with a mallet (with the belts on) to break it free.
--
-Fred W
#18
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On Tue, 20 Mar 2007 17:09:09 +0100, Yvan <me (AT) privacy (DOT) net> wrote: Nedavno MW de Jager napisa: Last 7 digits of VIN AV70871 Thanks in advance MW You should have one: http://www.realoem.com/bmw/showparts...& hg=11&fg=35 I already sent him a picture with part numbers.......... Sir Hugh of Bognor The difference between men and boys is the price of their toys. Intelligence is not knowing the answer but knowing where and how to find it! Hugh Gundersen hsg (AT) h-gee (DOT) co.uk Bognor Regis, W.Sussex, England, UK |
good news is that he won't have to worry about removing the old one. ;-)
To the OP, an alternative would be to rig up a thermostatic switch of
some sort to sample the coolant temp in the radiator and wire that to
the aux fan. That fan is certainly powerful enough to take care of your
cooling needs and then when at speed and the rad temp falls it will
switch off and save power. Worth considering...
--
-Fred W
#19
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Jeff Strickland wrote: I think your fan clutch is failing. You have a fan tht is driven by the fan belts on the front of the engine. There is a clutch (viscous coupling) that is supposed to lock up as the temp rises. When the clutch locks up, the fan is physically driven by the belts, the rest of the time, the fan can easily be stopped from rotating, and slow speeds (idle speeds, not traffic speeds), the fan might not even spin at all. Should the fan spin slowly, or not at all -- even worse -- the engine will over heat. This condition will right itself when traffic speeds go back up. What happens then is that the air flow over the radiator take splace because the car is moving, but in stop-n-go traffic, the air flow is caused by the fan that has stopped working. +1. Sounds exactly like the viscous fan clutch has gone tits up. It's a fairly easy do it yerself. You just need to know it threads onto the waterpump backwards (CCW = on, CW = off). Once you find a wrench to fit the big nut, rap the end of the wrench (in the aforementioned direction) it with a mallet (with the belts on) to break it free. |
when I sent him the picture of what he should have.
Sir Hugh of Bognor
The difference between men and boys is the price of their toys.
Intelligence is not knowing the answer but knowing where and how to find it!
Hugh Gundersen
hsg (AT) h-gee (DOT) co.uk
Bognor Regis, W.Sussex, England, UK
#20
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hsg (AT) h-gee (DOT) co.uk wrote: On Tue, 20 Mar 2007 17:09:09 +0100, Yvan <me (AT) privacy (DOT) net> wrote: Nedavno MW de Jager napisa: Last 7 digits of VIN AV70871 Thanks in advance MW You should have one: http://www.realoem.com/bmw/showparts...& hg=11&fg=35 I already sent him a picture with part numbers.......... Sir Hugh of Bognor The difference between men and boys is the price of their toys. Intelligence is not knowing the answer but knowing where and how to find it! Hugh Gundersen hsg (AT) h-gee (DOT) co.uk Bognor Regis, W.Sussex, England, UK So it seems we were all right. It is a *faulty* fan clutch. And the good news is that he won't have to worry about removing the old one. ;-) To the OP, an alternative would be to rig up a thermostatic switch of some sort to sample the coolant temp in the radiator and wire that to the aux fan. That fan is certainly powerful enough to take care of your cooling needs and then when at speed and the rad temp falls it will switch off and save power. Worth considering... |
Funny you mention that Fred. once upon a time - long long ago.....
I designed an electronic fan control for auxillary fans - works very well even
now and I give the circuit to my school kids in the electronics classes to build
and test.
If you want the pictorial I can email it but if you guys want it email me off
list and I'll sen it all at once to save me time. It'll came as a jpg.
Sir Hugh of Bognor
The difference between men and boys is the price of their toys.
Intelligence is not knowing the answer but knowing where and how to find it!
Hugh Gundersen
hsg (AT) h-gee (DOT) co.uk
Bognor Regis, W.Sussex, England, UK
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