HVAC SYS. DOES NOT SUPPLY HEAT OR COOLING. Chevrolet Blazer

SUBJECT: HVAC SYSTEM DOES NOT SUPPLY HEAT OR COOLING WHEN COMMANDED OR EXTENDED CHARGE TIME FOR THE PROPULSION BATTERIES (REPLACE THE HVAC REVERSING VALVE)

MODELS: 1997 CHEVROLET ELECTRIC POWERED S TRUCKS BUILT PRIOR TO VIN V8190295

CONDITION:

SOME OWNERS OF EARLY PRODUCTION S-10 ELECTRIC POWERED TRUCKS MAY REPORT THAT WHEN HVAC SYSTEM HEAT IS SELECTED, COOL AIR IS DELIVERED OR, WHEN AIR CONDITIONING IS SELECTED THE HVAC SYSTEM DELIVERS EITHER INSUFFICIENT COOLING OR HEAT. IN ADDITION, AN OWNER MAY ALSO REPORT EXTENDED CHARGING TIMES FOR THE PROPULSION BATTERIES.

CAUSE:

THE REVERSING VALVE IN THE HVAC SYSTEM MAY BE MALFUNCTIONING.

CORRECTION:

FOLLOW THE STRATEGY BASED DIAGNOSTIC STEPS FOR THE OWNER'S REPORTED SYMPTOMS. IF DIAGNOSIS DOES NOT REVEAL A CAUSE, REPLACE THE HVAC SYSTEM REVERSING VALVE, P/N 27003626, FOLLOWING THE PROCEDURE DESCRIBED IN THE SERVICE MANUAL.

IMPORTANT: WHEN RECHARGING THE AIR CONDITIONING SYSTEM, TO PREVENT OVERCHARGE USE ONLY 2 LB. OF R-134A REFRIGERANT.

PARTS INFORMATION

P/N DESCRIPTION QTY 27003626 REVERSING VALVE, HVAC 1

WARRANTY INFORMATION

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OP DESCRIPTION LABOR TIME D3139 HVAC VALVE REVERSING, USE PUBLISHED REPLACE LABOR OPERATION TIME

FIGURES: 00 CAPTIONS: 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.