I have a 1990 f150 Lariat. Power window problem on drivers door. Window has new motor and new switch. Worked ok after installing switch, but not so well after putting door panel back on. Window goes down about 1/3 slowly and back up the same.

 

Take the door panel off and make certain you don't have anything in the way of the lift mechanism or the window.

 

Thanks Kevin. I can't find anything in the way of the lift mechanism, but think the window could be in a bind going up and down. I'll have to wait until I get a new motor to check the problem because whatever is binding it blew the motor. I will repost after I install the new motor.

 

Thanks for the suggestion Kevin. Turns out I had a bad motor. Installed the new one and window works great.