Temperature Gauge - Reads High on Normal Driving

91pontiac05

Bulletin Number: 91-8-11
Reference Number: 138107
Publish Date: 4/91


Subject:
INDICATED OVERHEAT CONDITION (REPLACE SENSOR)

Models Affected:
1990-91 TRANS SPORT MODELS


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 VIN MT210327.

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 sensor with P/N 10200490.

Parts are currently available from GMSPO.

Labor Operation Number : T1720

Labor Time : .5 Hours