|Originally posted by tshark:|
In the meantime, I don't understand why one side behaves differently from the other. If I turn by hand, the module shouldn't be involved. I get the same behavior. How is the arm supposed to be installed?
The headlights are catching on something when the hood is closed.
Module is basically 2 modules and one side does not know the other side is doing or having problems.
Is very possible the module is seeing both motors having problem but killing power because binding a motor happens at odd times out side normal end of travel.
You have lift assembly out...
4 slotted holes on "firewall" set wrong could do this. Making the lift hitting hood, door or whatever.
Bad Doors and door adjustment can cause binding on the lift, hood, or both.
Missing/damage Door parts could bind the lift assembly.
Lift should hit only the door and only max at 4 points.
1. Door "bearing" plastic hit the lift at 2 points on the bucket.
2. The HL Trim may hit the door only when the lift is full open. Two spot at front top of trim.
Any other contact then can cause binding opening closing or both, often at different points.
In this picture, the right "backup bearing" hits the door. You care see ~1" of door rubs on the spot. Area is cleaner then rest of door.
The lift open and close then arm on motor etc is ok. Linkage is made to be fairly id10t proof.
If motor mount bolts are wrong could hit the Linkage
Motor adjustment screw should little play. If you can easily see big play then likely too loose.
Treat them as 84-87 front wheel bearings... BB wants no preload and feel loose but easy to have too much play.
When wheel is on, the wheel is big and could see play at tire but close to center very hard to see. The motor knob is looking at center, like looking at lug nuts.
Too much play and motor brushes could have problem. One direction brushed are fine other because Knob end can't adjust. Other direction the motor shaft screws in and could be trouble, maybe even damage the brushes.
getting the play correct is important. The motor case etc grows/shrinks at different rates for heat in summer and cold in winter plus heat from radiator. (Car color and where you park can help or hurt here.) Sadly GM didn't publish any data. You have to hope you got it right.