How to Replace drivers electric window motor on 1990 F150?

Answer 1

Answer - Check out answer #2 also below I have a 1990 F150 and I've changed both power window motors in it, twice.

First, be sure it's the motor, not the switch. There's a quick disconnect inside the door. Disconnect the motor there and attach either an automotive test light or a voltmeter and try to raise/lower the window. You should see 12 VDC with a meter or the test light should come on. If it does, try the motor.

To remove the motor, first secure the window glass with several long pieces of Duct Tape, or something similar, to keep the glass from falling once you remove the window regulator.

There are three or four rivets that hold the window regulator assembly to the door. These will have to be drilled out and then you can remove the assembly. You have to slide the regulator arm out of the bottom track of the window itself, and then it's a matter of maneuvering the assembly out of the door.

Once it's out, there are three bolts that hold the motor to the assembly. Remove the motor and replace it. I have aftermarket motors from one of the major auto parts stores which have lifetime warranties, which I've already made use of. They are much cheaper than the dealership, and will honor their warranty as well. Do your homework on price.

To reinstall, reassemble the motor/regulator and worm it back into the door. Since you drilled out the rivets, you can use 1/4-20 bolts, washers and nuts to hold the assembly on. Put the bolts in from INSIDE the door, so that the bolt head is facing inside, and the bolt body is sticking out. Use at least a 1 inch bolt, and once you have the washers and nuts on it, tighten it down and cut off the excess using a rotary tool with a cutoff wheel. If you don't, your door panel won't fit.

This is exactly what I did on my truck, like I said, on both doors. Twice. Once because I used a part from a junkyard and it died, and once because the aftermarket part broke.

Hope it helps...

ANSWER #2

I didn't remove the regulator just the motor. Remove the door panel and the bracket (2 screws) allowing you to reach the motor by placing your arm into the door.

The motor has three bolts holding it to the regulator. One is visible but a socket wont fit on it. Cut out a small V shaped piece of the door with metal cutters (tin snips) to gain access to the bolt. Then hold the new motor up to the door (using the visible bolt as a guide) and mark where the other 2 bolts are (my truck had dimples in the metal already). Drill a 1/2 inch hole on these marks. You now have access to the bolts.

I broke loose the bolts then used a cordless drill with the socket to remove the bolts while holding up the motor. To install the new motor rotate it into the regulator so the gears mesh then while holding it start each of the bolts. Then tighten with the cordless. It works the same using a rachet just takes a little longer.

The job took about an hour and a half and wasn't the hard..