LOW COOLANT LIGHT, ERRATIC TEMP GAGE

Model and Year: 1987-88 CAVALIER, CORSICA, BERETTA MODELS WITH 2.8L (VIN CODE W) ENGINE

Some customers driving 1987-88 models listed above equipped with a 2.8L engine (VIN Code W), may comment on the following:

1). Low coolant light flashing during acceleration.

2). Temperature gage needle pointing toward hot range.

3). Coolant not flowing from the reservoir bottle to the radiator.

These comments may be the result of air trapped in the coolant system preventing proper system fill and/or a damaged seal surface for the coolant filler cap assembly.

If customer comments are received regarding the coolant system, the following service inspections and repair procedures should be performed.

. Inspect coolant system for proper fill level.

. Inspect radiator neck for damage to the cap sealing surfaces.

. Verify filler cap function by removing the coolant recovery hose at the filler assembly and applying a vacuum to the recovery hose fitting.

NOTICE: A FUNCTIONING CAP WILL HOLD A VACUUM OF 15 TO 25 INCHES-MERCURY FOR SEVERAL MINUTES.

. Repair/replace the coolant filler assembly or filler cap assembly as required.

. Fill and pressure check the coolant system. Check the coolant recovery hose and connections for coolant leaks. Repair as required.

. Run engine until normal operating temperature is obtained and then let cool to ambient temperature. Recheck the coolant fill level, toping off as required both the radiator and recovery tank. A second complete thermocycle is recommended to ensure all air has been purged from the system.

Use applicable Labor Time and Operation Number.

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.