INFO - POWER STEERING PUMP LEAK DIAGNOSIS. Chevrolet Chevy MD Conventional (C Model) 1996

SUBJECT: INFORMATION - POWER STEERING PUMP LEAK DIAGNOSIS

MODELS: 1994-98 CHEVROLET AND GMC B6-7 T-SERIES TILT CABS, 7T SCHOOL BUSES, AND 6-7H CONVENTIONAL CAB MODELS WITH POWER STEERING

ON SOME MEDIUM DUTY MODELS LISTED ABOVE, THE POWER STEERING (PS) PUMPS ARE BEING REPLACED FOR LEAKS EVEN THOUGH THE FAULT MAY NOT BE IN THE PUMP. WARRANTY INFORMATION INDICATES "NO TROUBLE FOUND" ON MANY RETURNED PS PUMPS THAT WERE REPORTED AS LEAKING.

HOWEVER, WHEN THE PUMP IS REPLACED, THE CONNECTIONS AND THE LINES ARE CHECKED AND RECONNECTED WHICH USUALLY ELIMINATES THE LEAK CONDITION. REPLACING THE PUMP NEEDLESSLY DRIVES WARRANTY COSTS UP.

BEFORE DETERMINING THAT THE PS PUMP NEEDS REP|ACEMENT, DO THE FOLLOWING VISUAL INSPECTION IN ORDER TO FIND THE SOURCE OF THE LEAK:

INSPECTION PROCEDURE

1. WIPE OFF ALL OF THE PS LINES AND CONNECTIONS, ESPECIALLY THE LINE BETWEEN THE RESERVOIR AND THE PUMP.

2. START THE ENGINE.

3. INSPECT THE PS LINES AND CONNECTIONS IN ORDER TO DETERMINE THE ACTUAL LEAK PRIOR TO AUTOMATICALLY REPLACING THE PUMP. DO NOT ASSUME THAT THE PUMP IS LEAKING.

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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.