Hi cipnj718. Welcome to the forum. This is a classic case of the "ever since" syndrome. "Ever since you changed my oil, my power antenna doesn't work". At some point in time, something on your car stopped working. Where were you or what were you doing when that happened? If you were driving through the bank drive-up, the bank must have caused the problem. Where where you when the rear motor died? At the repair shop; therefore, the shop caused it to die. That is the logic, and I know it stands to reason they caused the problem, but don't be so quick to blame them until you know for sure what the problem really is. Every part that fails was working the minute before the failure. It is very possible you were driving to the shop the minute before the failure.
First of all, with the engine not running, try to operate the rear window while watching the dome light very closely. If you see the light dim just a little when you press the window switch, the motor is trying to run. It could be stuck due to a frayed cable. That will happen all of a sudden. The rubber tracks can become gummed up but that causes the window to run slowly, not stop completely.
If you do not see the dome light dim a little, no current is going through the motor. Possible causes are a broken wire between the right rear door hinges or the driver's door hinges. The driver's door is the most common place to find broken wires because it gets opened more.
Most window motors have a thermal cutout to prevent overheating. Those thermal units actually cause more trouble than they prevent. When the contacts become pitted, the motor will run very slowly or not at all. The test for that is to measure the voltages on the two motor wires and / or to apply voltage directly to the motor to see if it runs.
To actually cause damage to the motor, they would have to remove the trim panel, drill out the rivets holding the regulator to the door, pull the assembly out, remove the motor from the regulator and take it apart. That sounds like an awful lot of work. If you really think they would go through all that trouble, take the car to a different shop and have them diagnose the problem. Ask them to check for signs that the problem was caused intentionally, but be aware most reputable shops do not boost their reputation by cutting their competitors down. That is a trick dishonest shops use.
Thursday, June 24th, 2010 AT 3:48 PM