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Old 04-26-2000, 08:39 PM
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Join Date: Feb 2000
Location: Santa Clarita, CA, USA
Posts: 133
I have a 1991 420SEL and the driver's window operates slowly. When I press the down switch it does not move at all. I have to hold down the switch for a good 10 sec or more to get it to open. When it does open, it rolls down slow at first then builds up speed. It consistently operates this way. It never opens quickly like the other 3 windows.

1) What would be the most probable cause? Dirty switch or worn/dying motor?

2) If it's the switch, how can I remove it? The switch on this model and year is UNDER the wood panel. Any tips on how to get at it? The center console has a lockable storage space.

3) Any other possible causes...relays...etc?

Any help would be greatly appreciated. Thanks in advance...this is a great site!


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Old 04-26-2000, 08:44 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
In most cases this is both the motor and the regulator. When the regulator starts to wear, it will cause resistance and then the motor has to work harder. Replace both and the problem is solved.

Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
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Old 04-27-2000, 04:40 PM
Registered User
Join Date: Feb 2000
Location: Santa Clarita, CA, USA
Posts: 133
Thanks for the reply...seems to be an expensive proposition to replace them arbitrarily. Is there anyway to test it for sure. Maybe grease the regulator? Thanks again


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