your basic, garden-variety VW window regulator is made up of several components:
1. the motor with drive gear
2. the driven wheel
3. the cable, which winds around the driven wheel
4. the bracket that the motor bolts to
5. the window sliders with cable-rollers
The driven wheel gets sandwiched between the motor gear and the bracket. When the motor turns, the cable spools either one way or the other on that driven wheel, and the window mounts are driven in unison up or down.
In the mk4, the window motor serves many more purposes than in the mk3. Its attached control module is also that DOOR's control module for the comfort system. If you don't have that window motor with control module in there, then say goodbye to convenience-close/open, and the mk4 keyless alarm system and a whole lot of other interconnected systems.
Just for fun tonight (after I got some semi-bad news from luke ) I pulled myself away from the interior and sat down with some window regulators, to see what the prospects were.
mk3 window regulator:
mk4 window regulator and the "assembly carrier" that I drilled it off of:
my new hybrid mk3.75 window regulator:
Don't get too excited, it's not a perfect fit....but it does show some promise. I use the following parts:
1. mk4 motor with drive gear
2. mk3 driven wheel
3. mk3 cable, which winds around the driven wheel
4. mk4 bracket that the motor bolts to
5. mk3 window sliders with cable-rollers and glass clamps
The problems are few, but are caused by the following facts: the mk3 cable is fatter than the mk4 cable. the mk3 driven wheel is larger in diameter by about 1/2 to 2/3mm. the cable spooled on the wheel, pressed into the bracket...fits too snug in there. It's not TOO bad, but I can imagine, over time, the window motor burning out from too much friction...or maybe the pinch-protection will kick in every third time I use the window.
But, as far as I can tell, there is nothing wrong with me trying to bore out the bracket by 1/2mm and seeing if that helps. We'll see. Project for another day, but I'm happy with today's results.
Here's another pic of the dash, before I have to rip it all apart again. That's the bad news I got from Luke. He said I'm gonna have to weld an extension onto the mk4 steering column in order for the end to reach the steering gear. fuque.
Modified by punkassjim at 5:12 PM 10-29-2004