TEMPERATURE GAUGE READS HIGH UNDER NORMAL DRIVING CONDITION

SUBJECT: INDICATED OVERHEAT CONDITION (REPLACE SENSOR)

MODELS/YEARS: 1990-91 SILHOUETTE

CONDITION:

---------- The engine temperature gage may read high (into the red zone) under normal driving conditions.

CAUSE:

------- An improper material in the tip of the temperature sensor can cause the temperature gage to read too high. The sensor was changed in production with vehicle number MT305067.

CORRECTION:

------------ Verify that the engine does not have a true overheat condition by comparing the temperature reading of the ECM coolant sensor (measured with a SCAN tool) to the gage reading. If the ECM sensor reads normal at the same time the temperature gage reads high, replace the temperature gage sending unit with P/N 10200490.

WARRANTY INFORMATION:

Use labor operation number N2230 with the current posted time and trouble code 92.

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.