How do you determine if your switch or motor is bad on 1997 grand prix driver side window it will work when it is cold but will not when the temp outside gets warm?

The power window motor/regulater on these cars are a cable based system .....when the window is slow to go up or down it means the cables are Rusting out and need replacing......OR if not rusty try oiling the cables on back of slider......NOTE:(( you can buy from the dealer or get an aftermarket at about half the price)).....this isn't all that hard to do ....First remove the inside door skin ....this is done by first removeing the screws behind the inside door handle ,,then use a flat screw driver to GENTLY pop the skin off ...working aroud the edge of the door. ...next reach in and unplug the power window and lock plugs and remove the skin......once this is done there are four screws that keep the motor in place 2 on bottom and 2 on top...you may have to move window down a bit to see top 2 screws ....NOTE use a shim to keep window from falling down when you remove screws...don;t want to let that window drop....once the screws are out you can remove the old assembly by manuevering it out thru the holes in door.....the window will have no support at this stage....REMEMBER to shim window ......replace with new assembly and do everything in reverse order... good luck .....takes about an hour