Question about 1998 Toyota Corolla
98 corolla, drivers side window rolls down about 3 inches and stops. Rolls back up intermittantly quarter inch at a time. Do I need to replace the motor, regulator, or both? Thanks
I just repaired a 1999 Corolla (160,000 miles) window regulator with the same problem. I checked the motor commutator windings for shorts and the motor was OK. The brushes were still good. The motor is built like a clock - extremely well made with almost no indication of wear. Bench testing showed that the motor would not rotate once it had been run for a few seconds.
Elsewhere on the Internet someone mentioned a PTC Thermistor. This was exactly what was causing the problem. This is a special type of resistor "in series" with the motor that increases resistance when hot. It prevents the motor from drawing much current when stalled at the top or bottom of the window travel or in event of a jam, etc. The thermistor doesn't look like a standard "Radio Shack" part. By pulling off the motor top the magnets and commutator pull out. The PTC Thermistor is the two large copper plates separated by a silver looking material about 0.001" thick that are in series with one of the brushes. To fix, short out the thermistor. I tested with a small clip of copper wire. I made a permanent fix by soldering a jumper from one plate to another. During assembly, don't break the brushes.
The power window works great! I don't need an "electronic minder" to stop power to the motor at the top or bottom of the travel; I can do that. I don't intend to place my head in the window and push the button. If you have kids, this fix might not be for you.
Posted on May 31, 2009
I respectfully disagree.
WD-40 contains volatile ketones that will damage the rubber.
Pure silicone spray is the ticket here.
What you have going wrong is a bad "positive temperature coefficient thermister" in the window motor. It cannot be replaced, it is part of the motor assembly. You are going to probably need to replace the motor in the near future. The PTC understands a slight overheat condition, and when the motor "drags", or goes slow, the PTC opens up like a circuit breaker. Then, after it cools off, it closes, and the motor works again.
Lube the rubbers with silicone, and consider replacing the motor.
Posted on Mar 07, 2009
Try WD40 in window track. It does sound like bad motor.
Joe ASE Master Tech
Posted on Mar 04, 2009
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Posted on Jan 02, 2017
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