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sneillyboy
Newbie


Joined: 08 Apr 2013
Posts: 5



PostPosted: Sun Oct 15, 2017 1:05 pm    Post subject: 1983 911 sc fan motor issue Reply with quote

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
 
  
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grbspeedster
Montreal


Joined: 11 Nov 2007
Posts: 538
Location: Rugby


PostPosted: Sun Oct 15, 2017 3:04 pm    Post subject: Reply with quote

If you post on impactbumpers.com I am sure one of the guys on their will know
Good luck
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996 X50 turbo cab
 
  
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5330
Location: Brighton


PostPosted: Sun Oct 15, 2017 3:26 pm    Post subject: Reply with quote

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
Zolder


Joined: 21 Mar 2015
Posts: 5330
Location: Brighton


PostPosted: Sun Oct 15, 2017 6:21 pm    Post subject: Reply with quote

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



PostPosted: Thu Oct 19, 2017 5:58 pm    Post subject: progress Reply with quote

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

Bow [/img]
 
  
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5330
Location: Brighton


PostPosted: Fri Oct 27, 2017 6:18 pm    Post subject: Reply with quote

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 Embarassed


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
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Joined: 08 Apr 2013
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PostPosted: Fri Oct 27, 2017 6:55 pm    Post subject: Reply with quote

really need to know how to test/ repair the resistor set in the plug connection ?
 



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deMort
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Joined: 21 Mar 2015
Posts: 5330
Location: Brighton


PostPosted: Fri Oct 27, 2017 7:05 pm    Post subject: Reply with quote

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


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PostPosted: Sun Oct 29, 2017 5:54 pm    Post subject: Reply with quote

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 ! Smile Very Happy Very Happy

many thanks for ur help worship

Neill
 
  
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