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#1
09-17-2009, 07:16 PM
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W123 window motor removal
W123 300d rear pass side window motor
So i got the new regulator in place to now find window motor isnt working, worked intermitently right after install just enough to raise the window all the way up. i guess leaving the motor hanging for a couple of days damaged it or maybe there is some way to reset it?? I have a spair motor, does anyone know if i need to remove the regulator all the way to swap motors? Thanks
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W123 1985 300TD naturally aspirated 
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#2
09-17-2009, 08:55 PM
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Two things to check on the 123 Chassis....
There are a couple of reasons that the rear windows don't work properly...
On the 123's, 124's and the 201's, the wiring that goes from the pillar to the door wiring can break...this can be an easy fix. While holding the window switch, open and close the door slowly...if the wiring is the problem, you find out because the window will begin working. The other problem is a bit more trouble. Because some of these motors were not well insulated from moisture, the shaft will rust to the bushing in the inside bottom of the motor. The bushing will then spin in the motor housing. The motor will run, but the housing will get really hot where the bushing is on the inside of the motor housing...you'll know it if when you touch the bottom of the motor, it's really hot. I've tried to repair the rusty shaft problem on a number of occasions, but the best solution is a good used motor. Hope this helps.... The Tenor Man
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Currently Driving..... 1987 Mercedes Benz 300D Turbo - Daily Driver. 2004 Buick Rendezvous...Smaller than it looks! 2005 Mitsubishi Galant - Not bad for a tin box...Lousey Seats Past Vehicles..... 1994 Dodge B-250 Van- GAS HOG..Succumbed to rust! 1989 Mercedes Benz 260E - Totaled but no one injured. 1977 Mercedes Benz 240D - Loved it, but SLOWWW! - Succumbed to RUST! 1976 Mercedes Benz 240D - Same as above! - 1975 Mercedes Benz 240D - Same as above!
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#3
09-17-2009, 08:55 PM
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It may not be the Motor.
The little contacts in the switch/s get burned. In the pic below all of the contacts need to be cleaned up the red arrow points to the worst one. It also would not hurt to check you window fuses. The one it the pic looked good until I pulled it out of the Fuse Holder.
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84 300D, 82 Volvo 244Gl Diesel
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#4
09-18-2009, 09:30 AM
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Quote:
 I actually had one of those fuses melt down to half of its original size.
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AJ 1985 300D (SOLD) 
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#5
09-18-2009, 11:40 AM
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So all of a sudden the window works, i pulled the motor and reinstalled it, while i had it in my hand i noticed water or some kind of clear fluid, i do recall that while i had the window and regulator down for a couple of days it rained and maybe some water got inside, the mysterious part is that it started working again.
Can a motor just stop working and then come back to life? Im going to check my fuses but i dont think it be the fuse since driver side front window is not failing. Does anyone know if i can use a front driver side motor on a rear passanger side? Ep
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W123 1985 300TD naturally aspirated
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#6
09-18-2009, 11:58 AM
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Sounds like a flaky connection somewhere.
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