BROKEN WINDOW REGULATOR TAPES NEW LOW TORQUE WINDOW MOTORS

VEHICLES AFFECTED: 1984 Chevrolet Corvette

Some power windows may not be closing due to broken drive tapes.

Beginning with VIN E5111879, Bowling Green has changed to regulators with low torque motors and a new flex rack design.

Whenever a vehicle requires servicing of the door components, inspect for interference between the forward upper attaching screw and the upper end of the tape drive. If interference exists, one of the following options should be performed:

1. Add a washer (P/N 14038397), or equivalent, under the upper forward attaching screw (See Illustration).

2. Remove the forward attaching screw (P/N 11503800) and grind approximately 3mm from the threaded end.

This is to prevent contact between the bottom of the screw and the upper end of the tape drive. If this contact exists, excessive stress is created in the tape and could cause a failure.

Part numbers on the regulators did not change. To identify the revised regulators, check the electric motor part number.

Old Hi Torque - P/N 22039929 New Low Torque - P/N 22048553

A limited number of service regulators with new flex racks and low torque motors have been available since July 18, 1983. By the end of August, an adequate supply of regulators should be available.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.