Instruments - Indicated Overheat, Add Resistor

89pontiac11

Bulletin Number: 89-8-14
Reference Number: 938113
Publish Date: 5/89
Subject: INDICATED OVERHEAT (ADD RESISTOR)


Models

Affected: 1988-1989 PONTIAC 6000 SERIES W/2.8L AND ANALOG GAGE PACKAGE

On 1988-89 Pontiac 6000 Series cars with 2.8L engine and optional analog gage package, the temperature reading may show a reading to the right of center (220 degrees). While there are no other indications of overheat, and the engine is not actually overheating, the reading may cause customer concern.

Correction:

1. Attach a scanner to the ALDL connector. While driving the vehicle at normal highway speed, verify that the engine temperature shown on the scanner does not exceed 220 degrees F, or 105 degrees C. If this temperature is exceeded, look for the cause of actual engine overheat.

2. Turn ignition to "Off" position.

3. Locate the temperature sender in the rear cylinder head, near the left end of the head. Disconnect the sensor. Install a 20 ohm, 1/4 watt resistor in the wire harness to the sensor (obtain the resistor from a local electronics store). There are two wires in the connector - one for the sensor, and a black wire for the temperature lamp switch. Install the resistor in the colored wire. Be sure to solder the connections and tape the wire. Reconnect the sensor.


4. Road test to insure that the gage now operates properly.

Labor Operation : T1485
Labor Time : 0.8 Hours