tveltman

there is a small thermal switch inside the motor. I've taken mine apart and made sure all the contacts are good. The switch passes current when cold, bit it seems that it is really eager to break the circuit since the window will go up and down a couple times, but then will stop and start, and not translate in a smooth motion. Granted, this is 100% better than a non-workin window, but is there any reason not to just jumper the two terminals and bypass this "feature"?

JoeTaylor

Have you a photo of the thermal switch or a part number to post? I bet you can replace it with the same or an equivalent one, plenty of those things around, like in your hair drier, etc.

tveltman

Unfortunately I didn't take any pictures while I was repairing the motor, but while ive got the door apart I'd like to fix it rather than having to take the door apart again after the part, which, as it happens, doesn't have an obvious part number on it, comes in. Wow. That was a ****ty sentence but I'm on my mobile so no help for it. Am I courting disaster if I just bypass the switch?

Maleficio

Bypass the switch. Let the fuse take care of it.

WallyP

You could try bending the bimetallic spring to make firmer contact, which would then require a higher temp before it disconnects.

If all else fails, you can by-pass the protector. If the switch hangs on the console (common problem), leaving the motor actuated, it can fry the motor.

The switch is not available thru Porsche.

JoeTaylor

You could run the motor without the thermal overload switch, this is assuming the overload switch is bad.

If it was me, I would try to find an electric shop and see if they had a part for it and/or could rebuild the motor.

Surely with all the parts cars floating around with folks here on Rennlist, you might just be able to get a used window motor and replace the whole thing. Enough with the "trying to repair it" senario.

Joe

tveltman

Haha Joe,
I totally understand where you are coming from. But tinkering is half the fun, right?!?
Maleficio is right though, they are fused so bypassing isn't a big deal.

Thanks all!

JoeTaylor

You might be right.

I had one thought, maybe the thermal switch is a safety feature in case you roll the window up on someone head/arm/leg etc. More so than the protect the motor windings.

The second throught was that there is a short in the windings and the thermal protection is just doing its job, thus the rewind shop.

Something to think about.

Maleficio

Good point.

tveltman

I jumpered the thermal protection switch and reinstalled, but, as Joe may have predicted above, it seems that the window motor is still finicky. It will roll down the window in one go (though slowly), but when you try to roll it up, it hangs and needs multiple "bursts" to get the window up. Initially I thought that this was a consequence of not enough lubrication on the winder mechanism, but now that I think on it, it could also be a short in the windings. It doesn't blow the fuse after I jumper the thermal switch, so I guess that could reinforce either explanation, if it is an intermittent short.

Advice? Should I just relube the mechanism, or source a new motor (like maybe from the sunroof as a stopgap measure) and THEN relube the mechanism?

Thanks in advance!

Maleficio

Try using the window switch for the other side (center console switch), and see if it works any better. If so, replace the switch.

Also, you may have some degraded wiring in your door. I had a broken wire in my driver door that would work intermittently. With the door open, the window wouldn't respond. So I opened it all up and replaced the wiring in the door. Works great now. Plus I have new switches.

JoeTaylor

Your time is worth something too. Time to cut you losses and replace the motor.

The part number is something like: 928-624-013-04

Pelican has the window motors here: http://www.pelicanparts.com/catalog/...ISCLL_pg10.htm

I am sure others have motors for sell, maybe Roger has a clean used window motor.

What is the year and model of your 928?

Joe

stevedavies

Porsche 928 window motor 85 to 95 is exactly the same as the motors used in the following SAAB models


SAAB 900 2.0 L 8v 79 to 88
16v 86 to 90
2.1L 16v 91 to 94
2.0L Turbo 8 v 79 to 84
2.0L Turbo 16v 85 to 94

They all use the same plastic cover ...if I recall I had to break a small piece off to fit the Porsche 928 set up. BUT it completely covers the motor and prevents water landing on the motor. I found it impossible to stop water coming in via the window seals!!

These motors/ covers are much cheaper on SAAB ebay site!!!