Classic Audi Ľ Technical Ľ Mech/Tech Ľ Electrical problems » Advice please - Coupe GT rear wiper motor

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Old 01-09-19, 06:20 AM   #1
86audicoupe
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Default Advice please - Coupe GT rear wiper motor

Hi all

Latest job to tackle...rear wiper motor isn’t working. What are the common causes of failure? I’ve checked the obvious (relay and fuse). I’m assuming the best way to access it is by taking out the rear seat and rear shelf?

Thanks

Last edited by Isimmo; 01-09-19 at 09:49 AM.
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Old 01-09-19, 09:50 AM   #2
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Before you do, drench the column switches in contact cleaner. Then if no joy.

Itís back seat out, speakers out, remove parcels shelf. Couple of points to note, if it has not been out before, try to avoid stirring up the decades of dust or wear a mask as the foam on the back can also break down.

Then voltage test the wiring.

If the wiring is fine, the motor has died.
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Old 01-09-19, 10:08 AM   #3
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One more point, if as Ian suggests the motor has died, don't leave it switched on for any length of time with the ignition on. My B3 had been left under a car cover outside for several years and the wiper motor had seized up through lack of use. When it was being tested, the wiring got VERY hot, old PVC insulation loses its flexibility and overheating it will exacerbate the problem.
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Old 10-09-19, 12:53 PM   #4
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Hi chaps

Thanks for your reply and advice on this. Iíll go through your suggestions and report back
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Old 10-09-19, 01:04 PM   #5
BackintheFold
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i've found many seize up because of rust in the spindle.
If you have someone operate the wiper, and then manually assist the blade and find that it does work (you will feel the motor try to help) then you can remove it all, clean the motor and spindle, regrease (to keep water out of the spindle) and reassemble

I've done it more times than I remember (at least 4)
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Old 10-09-19, 02:13 PM   #6
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I've got a couple of these lying around doing nothing.

Let me know if you need one
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Old 10-09-19, 08:33 PM   #7
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Quote:
Originally Posted by BackintheFold View Post
i've found many seize up because of rust in the spindle.
If you have someone operate the wiper, and then manually assist the blade and find that it does work (you will feel the motor try to help) then you can remove it all, clean the motor and spindle, regrease (to keep water out of the spindle) and reassemble

I've done it more times than I remember (at least 4)
Ditto, done this twice on mine and still going though I expect the next time it will need new brushes too...
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