For 1990-2009 cars

# INFO. ON HEADLAMP LENS DISTORTION

#### SUBJECT: INFORMATION ON HEADLAMP LENS DISTORTION CAUSED BY HEADLAMP AIMING EQUIPMENT

#### MODELS: 1996 AND PRIOR PASSENGER CARS AND TRUCKS WITH PLASTIC HEADLAMP LENSES

WHEN USING HEADLAMP AIMING EQUIPMENT WHICH ATTACHES TO THE HEADLAMP ASSEMBLY WITH A SUCTION CUP TYPE DEVICE, DO NOT LEAVE THE LAMPS ON WHILE THE EQUIPMENT IS ATTACHED. ON VEHICLES WITH "PLASTIC" HEADLAMPS (BODY STYLED COMPOSITE OR SEALED BEAM), HAVING THE HEADLAMPS ILLUMINATED WHEN THE EQUIPMENT IS ATTACHED MAY CAUSE HEAT TO BUILD-UP BETWEEN THE PLASTIC HEADLAMP LENS AND THE SUCTION CUP. THIS HEAT BUILD-UP, COMBINED WITH THE SUCTION CUP, MAY CAUSE THE PLASTIC HEADLAMP LENS TO BECOME DISTORTED, REQUIRING LAMP REPLACEMENT.

MANY AFTERMARKET PARTS SUPPLIERS CURRENTLY OFFER REPLACEMENT HEADLAMPS MADE OF PLASTIC FOR PAST MODEL VEHICLES WHICH WERE ORIGINALLY EQUIPPED WITH HEADLAMPS MADE OF GLASS. AS A RESULT, YOU MAY ENCOUNTER VEHICLES THAT HAVE A MIX OF BOTH GLASS AND PLASTIC HEADLAMP ASSEMBLIES.

#### NOTICE: IN ORDER TO AVOID ANY POSSIBILITY OF DAMAGE, REGARDLESS OF WHETHER A VEHICLE HAS GLASS OR PLASTIC HEADLAMPS, IT IS RECOMMENDED THAT THE HEADLAMPS NOT BE ILLUMINATED WHEN USING HEADLAMP AIMING EQUIPMENT WHICH USES A SUCTION CUP DEVICE FOR ATTACHMENT.

ON VEHICLES WITH CONCEALED HEADLAMPS, FOLLOW THE INSTRUCTIONS IN THE OWNER'S MANUAL ON HOW TO KEEP THE HEADLAMP DOORS OPEN AND THE HEADLAMPS NOT ILLUMINATED.

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 1996 GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.