Posted: Sun Oct 15, 2017 1:05 pm Post subject: 1983 911 sc fan motor issue
Hi Guys
wondered if any of you could point me in the right direction ?
Have removed the fan assembly whilst car is away being painted .
Fan didnt work prior to removal so can you tell me how to test unit ?
What should the windings for each fan speed be ?
which of the 4 connections on the plug do what ?
thanks in advance
grbspeedster Montreal
Joined: 11 Nov 2007 Posts: 521 Location: Rugby
Posted: Sun Oct 15, 2017 3:04 pm Post subject:
If you post on impactbumpers.com I am sure one of the guys on their will know
Good luck _________________ Geoff
996 X50 turbo cab
deMort Shanghai
Joined: 21 Mar 2015 Posts: 4921 Location: Brighton
Posted: Sun Oct 15, 2017 3:26 pm Post subject:
Ive only found the 1984 diagram but i think its the same ..
Pin 4 would be the 12 volt supply
Pin 3 the earth for full speed
Pin 1 and 2 the earth for the slowspeeds . _________________
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deMort Shanghai
Joined: 21 Mar 2015 Posts: 4921 Location: Brighton
Posted: Sun Oct 15, 2017 6:21 pm Post subject:
Demort wrote:
Ive only found the 1984 diagram but i think its the same ..
Pin 4 would be the 12 volt supply
Pin 3 the earth for full speed
Pin 1 and 2 the earth for the slowspeeds .
Also spin the fan by hand .. ive seen a few now that are seized .. if so then removeing the fan from the motor in one piece is a pain but if you can its a lot cheaper than an entire fan unit . _________________
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sneillyboy Newbie
Joined: 08 Apr 2013 Posts: 5
Posted: Thu Oct 19, 2017 5:58 pm Post subject: progress
Thanks Guys
having tested by running 12v to the unit I have discovered that the fan will only run at full speed.
Can someone explain how the unit works that controls the 2 slower speeds ?
Really appreciate all of your help
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deMort Shanghai
Joined: 21 Mar 2015 Posts: 4921 Location: Brighton
Posted: Fri Oct 27, 2017 6:18 pm Post subject:
Demort wrote:
Ive only found the 1984 diagram but i think its the same ..
Pin 4 would be the 12 volt supply
Pin 3 the earth for full speed
Pin 1 and 2 the earth for the slowspeeds .
Sorry .. i missed this when you first replyed
If you have the fan removed or unplugged then put 12 volts to pin 4 and an earth to pin 3 that will be full speed ..
If you move the earth from pin 3 to pin2 then it will be one of the slow speeds with the earth on pin 1 being the other slow speed.
If neither slow speed works then its the resistor in the fan unit thats faulty .. if all works then its the switch or the wiring to the switch thats faulty . _________________
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sneillyboy Newbie
Joined: 08 Apr 2013 Posts: 5
Posted: Fri Oct 27, 2017 6:55 pm Post subject:
really need to know how to test/ repair the resistor set in the plug connection ?
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deMort Shanghai
Joined: 21 Mar 2015 Posts: 4921 Location: Brighton
Posted: Fri Oct 27, 2017 7:05 pm Post subject:
Aghh i answered your PM without seeing this .. the crimps look the most obvious place to go high resistance .
I think you have 2 contacts there that as they get hot will switch it to full speed .. the diagram would seem to indicate this so if you get full speed on pin 1 or 2 when given an earth then thats the fault . _________________
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sneillyboy Newbie
Joined: 08 Apr 2013 Posts: 5
Posted: Sun Oct 29, 2017 5:54 pm Post subject:
Thanks guys
so it would appear that the crimped terminations between the resistors and the 4 terminals suffer from corrosion !
Cleaned them up and ran solder into each one and result !
many thanks for ur help
Neill
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