For 1990-2009 cars

# LOSS OF HVAC MODES - ROUTE VACUUM LINE INSIDE THE FRAME

#### SUBJECT: LOSS OF HVAC MODES (ROUTE VACUUM LINE INSIDE THE FRAME RAIL)

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

#### CONDITION:

SOME OWNERS MAY COMMENT ON THE LOSS OF HVAC MODES. THIS LOSS OF FUNCTION WILL ONLY ALLOW AIR FLOW OUT OF THE DEFROSTER AND HEATER OUTLETS.

#### CAUSE:

DEBRIS (I.E., SNOW, ICE) MAY SPLASH UP AND ACCUMULATE ON THE VACUUM LINE FOR HVAC SYSTEM WHICH IS LOCATED UNDERNEATH THE VEHICLE ON THE PASSENGER SIDE. THIS ACCUMULATION WILL CAUSE EXCESSIVE WEIGHT AND POSSIBLE DAMAGE TO THE LINE. DAMAGE TO THIS LINE MAY CAUSE A VACUUM LEAK AND RESULT IN THE LOSS OF HVAC CONTROLS.

#### CORRECTION:

ROUTE THE VACUUM LINE INSIDE THE FRAME RAIL.

PROCEDURE -

1. DISCONNECT LINE FROM VACUUM CANISTER.

2. BECAUSE OF TWO POSSIBLE DESIGNS, SELECT ONE OF THE FOLLOWING.

A. REMOVE LINE FROM WELD STUD CLIP ON THE PASSENGER SIDE FLOOR PAN.

B. DISENGAGE CLIPS AND LINE FROM BOTTOM OF FRAME RAIL AND REMOVE CLIPS FROM LINE.

3. ROUTE THE LINE REARWARD THROUGH THE TRIANGULAR HOLE ON THE FORWARD RIGHT SIDE OF THE FRAME RAIL. EXIT THE LINE THROUGH THE SQUARE TYPE HOLE JUST FORWARD OF THE VACUUM CANISTER AND RE-ATTACH.

4. CHECK FOR LEAKS AND CYCLE HVAC SYSTEM MODES FOR PROPER OPERATION.

#### WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION NUMBER DESCRIPTION LABOR TIME =============== =========== ==========

D1705 HARNESS, VACUUM HOSE - 0.2 HR R + R OR REPLACE

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.

COPYRIGHT 1997 GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.