TEMPERATURE GAGE READS HIGH (REPL. INSTRUMENT PANEL CLUS.). Pontiac Sunbird 1993

SUBJECT: TEMPERATURE GAGE READS HIGH, ENGINE DOES NOT OVERHEAT (REPLACE INSTRUMENT PANEL CLUSTER)

MODELS: 1993 PONTIAC SUNBIRD

CONDITION:

SOME VEHICLES BUILT FROM MARCH, 1993 TO THE END OF PRODUCTION MAY EXHIBIT A HIGH GAGE READING WITHOUT AN OVERHEAT CONDITION.

CORRECTION:

INSTRUMENT PANEL CLUSTER CALIBRATIONS HAVE BEEN CHANGED AND ARE AVAILABLE FOR SERVICE.

VERIFY THE COOLING SYSTEM IS FUNCTIONING PROPERLY.

1. CHECK COOLING SYSTEM FOR PROPER FILL AND INSURE THAT THERE ARE NO LEAKS.

2. CHECK COOLANT FOR PROPER GLYCOL/WATER MIX. IT MUST BE SET AT -34 DEGREES FAHRENHEIT, (-37 DEGREES CELSIUS), (50-50 MIXTURE). TOO MUCH GLYCOL REDUCES THE HEAT TRANSFER AND WILL MAKE THE GAGE INDICATE HOT. COOLANT SHOULD BE CHECKED FROM THE RADIATOR DRAIN COCK (NOT THE SURGE TANK). AN OPTICAL REFRACTOMETER (J23688 OR J38633) SHOULD BE USED. THEY ARE TEMPERATURE COMPENSATED.

3. CHECK ECM COOLANT TEMPERATURE WITH VEHICLE FULLY WARMED UP. TECH 1 SHOULD READ 196 - 206 DEGREES FAHRENHEIT, (91 - 97 DEGREES CELSIUS), AT NORMAL DRIVING CONDITIONS. AT PROLONGED IDLE, ECM TEMPERATURE WILL INCREASE AS TOTAL SYSTEM HEATS UP UNTIL COOLANT FANS ACTIVATE AT 228 DEGEES FAHRENHEIT (109 DEGREES CELSIUS).

4. REFER TO SERVICE MANUAL SECTION 8A FOR ADDITIONAL DIAGNOSIS INFORMATION.

IF ALL SYSTEMS ARE FUNCTIONING AS DESCRIBED, CHECK CLUSTER IDENTIFICATION AND EXCHANGE WITH THE SPECIFIED CLUSTER LISTED BELOW FROM AN AUTHORIZED A/C DELCO CENTER. USE APPLICABLE LABOR TIME AND SERVICE MANUAL PROCEDURE IN SECTION 8C OF THE SERVICE MANUAL.

CLUSTER PART REPLACEMENT PART NUMBER/ NUMBER/ BROADCAST CODE RPO CODE USAGE BROADCAST CODE ============== ======== ===== ================

16189392 \ MNK UH7 DOMESTIC 16148772 \ MNA 16189412 \ MNM U39 DOMESTIC 16148792 \ MNC 16189422 \ NMP UB3 DOMESTIC 4 CYL. 16148802 \ MND 16189442 \ MNT UB3 DOMESTIC 6 CYL. 16148822 \ MNH 16189402 \ MNL UH7 CANADIAN 16148782 \ MNB 16189432 \ MNS UB3 CANADIAN 4 CYL. 16148812 \ MNF 16189452 \ MNU UB3 CANADIAN 6 CYL. 16148832 \ MNJ

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION NUMBER: N4180

FIGURES: 0

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.