Engine - Extreme Temperature Gauge Fluctuation

File In Section: 6 - Engine

Bulletin No.: 67-62-01

Date: April, 1996

Subject:
Extreme Engine Temperature Gauge Fluctuation (Install a New Thermostat)

Models:
1996 Chevrolet and GMC C/K, G Models
with 4.3L, 5.0L, 5.7L Engines (VINs M, R, X, W - RPOs L30, L31, LF6, L35)

Condition

Some owners may experience extreme engine temperature gauge fluctuation.

Cause

Thermostat was not optimally positioned to sense true engine coolant temperature.

Correction

Install a new thermostat which increases coolant flow past the thermostat temperature sensing element.

Parts Information

Refer to the following part number when replacing the thermostat:

Part Number Description

12557859 Thermostat

Parts are expected to be available on April 8, 1996 from GMSPO.

Warranty Information

For vehicles repaired under warranty, use:

Labor Operation Labor Time

J3500 Use published labor
operation time.