C900 Window motors

It's really not that hard. Remove the door trim, remove the screws which hold the window glass to the regulator, remove the bolts which hold the regulator assembly to the door, withdraw regulator assembly.

It helps to have another pair of hands (or lots of gaffer tape) to hold the window glass in place.

As far as recon motors, I've never needed one. The brushes are rarely very worn. What the motors need is a stripdown, cleanup and oil.

Thanks for your advice Grunff. Will give it a go at the weekend.

Mike P

From memory...

Remove the door handle surround; remove the screws holding the door inner shell to the door. Set these aside.

The motor has a spur gear on it which drives the window up and down. The easiest thing to check, and do this before you buy anything, is if it's just gummed up. At that age, it's not unreasonable to think that the substance-formerly-known-as-grease on the clock spring, and in the motor assembly, have formed into a rock-like substance. Degrease the spring with your favorite solvent, and re-apply something preferably of the synthetic variety. Then, while you have the motor off of the door (just hanging inside is fine), see if the motor runs. If the gear turns a bit, or sluggishly, then it's gummed up inside. It's fairly easy to remove the side plate & degrease and relube that as well.

If you've handled an engine swap, the window motors will be dead simple for you. No worries.

Dave Hinz

Thanks For your help Dave! Engine swap wasn't hard at all. I've done pretty much everything else on a car, but even non-electric windows scare me!! My last 900 had a right side window that would stick if you wound it right down. Solution was to remove the door card and thwack the motor with a hammer while pressing the switch..

MIke

Ha, ha! That doesn't sound as though you're scared to me, it's possibly its opposite, though...

Hi Mike - congrats on the new purchase.

One thing before you pull the doors apart ... open the actual switches and check for current passing. "Tired window syndrome" is attributed to a lack of current able to pass through the swicth due to poor contacts

- the contacts can be scraped clean. I presume that "stuck" windows

If you have Discovery Channel, try to catch a rerun of "Wheeler Dealers", daily at 19:00 hrs, where they have a 900 with the same problem, was an easy fix. Turned out to be the motors.

-- MH '72 97 '77 96 '78 95 '79 96 '87 900T8

You could find a slight older C900 with manual windows and grab the doors :-) You should have been the strange looks I got when I had to show people how to use a manual window crank.

for a visual guide to doing this, check out: