INSUFFICIENT A/C PERFORMANCE (WITH C34 - REAR A/C). Chevrolet Lumina APV 1996

SUBJECT: INSUFFICIENT A/C PERFORMANCE (WITH C34 - REAR A/C) WHEN USING FRONT SYSTEM ONLY (ADD 1/4 LB R134A TO SYSTEM)

MODELS: 1996 CHEVROLET LUMINA APV 1996 OLDSMOBILE SILHOUETTE 1996 PONTIAC TRANS SPORT WITH REAR A/C (RPO C34)

BUILT PRIOR TO THE FOLLOWING VIN BREAKPOINTS:

MODEL VIN BREAKPOINT LUMINA APV 117248 SILHOUETTE 306374 TRANS SPORT 212925

CONDITION:

SOME OWNERS OF THE ABOVE LISTED VEHICLES WITH THE REAR A/C OPTION, RPO C34, MAY COMMENT ON INSUFFICIENT AIR CONDITIONING PERFORMANCE WHEN USING THE FRONT SYSTEM ONLY.

CAUSE:

THIS CONDITION MAY BE CAUSED BY REFRIGERANT BLEEDING THROUGH THE REAR TXV AND BEING CAPTURED IN THE REAR EVAPORATOR AND SUCTION LINE. WHEN THIS HAPPENS, THE FRONT SYSTEM IS STARVED OF REFRIGERANT AND RESULTS IN POOR AIR CONDITIONING PERFORMANCE FROM THE FRONT SYSTEM.

CORRECTION:

THIS CONDITION MAY BE CORRECTED BY ADDING AN ADDITIONAL 1/4 LB (0.25 LB) R134A TO THE SYSTEM FOR VEHICLES BUILT PRIOR TO THE ABOVE IDENTIFIED VIN BREAKPOINTS. VEHICLES BUILT AFTER THESE BREAKPOINTS WILL INCLUDE THE ADDITIONAL 1/4 LB (0.25 LB) CHARGE.

IMPORTANT: FUTURE SERVICE TO THE A/C SYSTEM ON ANY 1996 U VAN SHOULD INCLUDE THE ADDITIONAL 1/4 LB (0.25 LB) CHARGE.

PROCEDURE -

O RECOVER THE EXISTING R134A, THEN EVACUATE AND RE-CHARGE THE SYSTEM TO INCLUDE THE ADDITIONAL 1/4 LB (0.25 LB).

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION NUMBER: T2042 LABOR TIME: 0.7 HR

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.