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John M
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OIL Cooler FAN ON at Start up???????
Guys, have a 87, and mysteriously the Right Fender Oil Cooler Fan came on upon startup for around 4-5 various times, now it doesnt come on at all??? What gives, Oil is moving around since it is Hot in and out tubes after a run. Short, thermostat, or ????? Any diagrams for electrical will help as well. Thanks! John
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"I Can't Drive 55!! |
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07-20-2004, 06:38 AM
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Registered
Join Date: Aug 2002
Location: Galivants Ferry, SC
Posts: 10,550
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The fan is wired through a relay.
One possibility is that the power contacts are always closed...regardless of control contact influence. ....bad relay. Another is a malfunctioning thermostat...always calling for "on"..... ---Wil
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Wil Ferch 85 Carrera ( gone, but not forgotten ) |
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07-20-2004, 07:24 AM
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"Cheap is expensive"
Join Date: Oct 2003
Location: Colorado
Posts: 514
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Odds are it's your thermostat which is NO (normally open) and closes when the temp reaches setpoint to activate the relay where your switched 12v is waiting at one side of the coil. Unlikely the relay.
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07-20-2004, 07:38 AM
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John M
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Override switch
How easy is it to establish a "toggle" switch to turn on when I would like it to be on.....or mute point if the t-stat is not working, also where is the t-stat located?? Thanks again. John
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"I Can't Drive 55!! |
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07-20-2004, 07:51 AM
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Registered
Join Date: Aug 2002
Location: Galivants Ferry, SC
Posts: 10,550
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Thermostat is inconveninently located on the top header of the oil cooler...front side where you can't easily see or reach for it. Threaded 14 mm connection, as I recall.
A substitute part from a C2 works here and is activated at 210-214 degF or so. Some BMW part may fit too. ---Wil
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Wil Ferch 85 Carrera ( gone, but not forgotten ) |
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07-20-2004, 07:58 AM
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"Cheap is expensive"
Join Date: Oct 2003
Location: Colorado
Posts: 514
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Of course what I mentioned was an educated guess and you won't know for sure until you trace the problem out. For example, since I removed my fog lights I changed a couple wires and use the fog light switch inside to run the fan when I want. This kept a clean look inside without adding any switches. You can either do that or use another switch wired in place of the thermostat to turn the fan on when you want. How hard? not sure, it depends on you and the setup.
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07-20-2004, 07:58 AM
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I just replaced my temp sensor switch last weekend with a 90C version. I think I used a 7/8 SAE wrench to remove the 99C switch and install the 90C switch. None of my metric open wrenches fit.
The way mine is wired is 12V from the relay to the Fan + terminal, the fan - terminal to the temp switch (either terminal) and ground the other temp switch teminal. I have considered running another wire off the fan - terminal with a switch to ground so that I could turn it on any time.
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Jim Dowty 97 911 Coupe (Forest Green metalic, sunroof, leather) PCA RSR region Insurance chair and Board member Gruppe B #309 |
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07-20-2004, 08:17 AM
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John M
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Sounds like a rainday project
Thanks for your replies! John
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"I Can't Drive 55!! |
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07-20-2004, 08:18 AM
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This is a good link for troubleshooting your problem:
Front fender Oil Cooler Question This link is a good one for wiring your switch: oil cooler fan thermoswitch Stoney
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74 Targa 3.0, 89 Carrera, 04 Cayenne Turbo http://www.pelicanparts.com/gallery/fintstone/ "The problem with socialism is that you eventually run out of other people's money" Some are born free. Some have freedom thrust upon them. Others simply surrender |
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07-20-2004, 10:49 PM
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1987 Porsche 911 3.2 Sold 2006
Boxster S
1997 Porsche 911
1974 Porsche 911 3.0
Yellow 911
