INSUFFICIENT A/C PERFORMANCE. Oldsmobile Silhouette 1997

SUBJECT: INSUFFICIENT A/C PERFORMANCE (REPLACE DRIVER'S SIDE ENGINE COOLING FAN AND/OR EXPANSION ORIFICE TUBE)

MODELS: 1997 CHEVROLET VENTURE 1997 OLDSMOBILE SILHOUETTE 1997 PONTIAC TRANS SPORT

CONDITION:

SOME OWNERS MAY COMMENT ON INSUFFICIENT AIR CONDITIONING PERFORMANCE IN SOUTHERN CLIMATES.

CAUSE:

CONDITION MAY BE DUE TO INSUFFICIENT ENGINE COMPARTMENT AIR FLOW AND/OR IMPROPER SIZING OF THE EXPANSION ORIFICE TUBE WILL AFFECT PERFORMANCE IN HOT HUMID CLIMATES.

CORRECTION:

REPLACE THE DRIVER'S SIDE ENGINE COOLING FAN ASSEMBLY AND/OR THE EXPANSION ORIFICE TUBE FOLLOWING THE PROCEDURES IN SECTIONS 6B AND 1B OF THE SERVICE MANUAL.

USE ONE OF THE FOLLOWING REPAIRS FOR A SPECIFIED VEHICLE -

FOR VEHICLES NOT EQUIPPED WITH REAR A/C (RPO C34) OR HEAVY DUTY COOLING (RPO V08), REPLACE THE 90W COOLING FAN MOTOR WITH A 240W COOLING FAN MOTOR AND .072 (WHITE) ORIFICE TUBE WITH A .062 (YELLOW) ORIFICE TUBE.

FOR VEHICLES EQUIPPED WITH REAR A/C (RPO C34) OR HEAVY DUTY COOLING (RPO V08), REPLACE THE .072 (WHITE) ORIFICE TUBE WITH A .062 (YELLOW) ORIFICE TUBE. THESE VEHICLES ARE ALREADY EQUIPPED WITH A 240W COOLING FAN MOTOR.

IMPORTANT:

WHEN SERVICING FUTURE VEHICLES, THE CORRECT ORIFICE TUBE MUST BE USED WITH THE CORRECT COOLING FAN ASSEMBLY. THE .072 (WHITE) ORIFICE TUBE SHOULD BE USED WITH THE 90W FAN MOTOR WHICH HAS A SMALL DIAMETER HOUSING THAT EXTENDS APPROXIMATELY 150 MM (1 1/2 IN.) REARWARD OF THE MOUNTING BRACKET. THE .062 (YELLOW) ORIFICE TUBE SHOULD BE USED WITH THE 240W FAN ASSEMBLY WHICH HAS A LOW PROFILE (LARGER DIAMETER) MOTOR HOUSING AND TWO (2) ROUND TYPE CAPS ON THE REAR OF THE MOTOR. IF THE INCORRECT FAN AND/OR ORIFICES ARE USED, THE A/C SYSTEM WILL NOT COOL THE PASSENGER COMPARTMENT SUFFICIENTLY.

PARTS INFORMATION:

P/N DESCRIPTION --- -----------

52473660 ORIFICE ASM., A/C EVAPORATOR TUBE (.062) 12363322 BRACKET KIT, ENGINE COOL FAN 22137037 MOTOR KIT, ENGINE COOL 10297635 SHIELD, ENGINE COOL FAN HEAT

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION LABOR OPERATION NUMBER DESCRIPTION TIME --------------- ----------- ---------------

J3401 MOTOR AND/OR BLADE, ELECTRIC USE PUBLISHED LABOR COOLING FAN - REPLACE OPERATION TIME

D3200 TUBE, EXPANSION (ORIFICE) - USE PUBLISHED LABOR REPLACE OPERATION TIME

FIGURES: 00 ATTACHMENTS: 00

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.