Temperature Gauge - Reads Too High
Group Ref.: Chassis/Body ElectricalBulletin No.: 438107
Date: April, 1994
SUBJECT:
TEMPERATURE GAUGE READS TOO HIGH (INSTALL RESISTOR)
MODELS:
1993-94 CHEVROLET CAMARO - PRIOR TO VIN R2173167
1993-94 PONTIAC FIREBIRD - PRIOR TO VIN R2229373
CONDITION:
The customer may comment that the temperature gauge reads too high, that the needle is in the red zone, or that the engine is overheating.
CAUSE:
The calibration of the temperature gauge in the cluster is incorrect. The clusters were corrected in production after VIN R2173167 (Chevrolet) and R2229373 (Pontiac).
CORRECTION:
1. Verify that the condition exists by comparing the cluster gauge reading with the reading from the ECM temperature sensor, using the Tech 1. The 3/4 mark on the gauge is about 235°F (113°C).
2. Disconnect the temperature gauge sensor connector. The sensor is shown in the 1994 Service Manual, page 8A-201-27, Figure 52 (V-6), and page 8A-201-16, Figure 29 (V-8).
Cut the dark green wire, and splice in a 10 ohm, 1/2 watt resistor. Solder the connections, and protect with shrink wrap to insure that the connection is waterproof. The resistor can be obtained from a local electronics supply store. One such source is Radio Shack, P/N 271-001 or equivalent.
Reconnect the temperature gauge sensor connector.
WARRANTY INFORMATION:
For vehicles repaired under warranty, use:
Labor Operation: N6270
Use Published Labor Operation Time.