Lighting - Polycarbonate Headlamp Damage Prevention

File In Section: 08 - Body and Accessories

Bulletin No.: 02-08-42-001A

Date: March, 2003

INFORMATION

Subject:
Chemical Damage To Exterior Polycarbonate Headlamp Lenses

Models:
2003 and Prior Passenger Cars and Trucks
2003 HUMMER H2

This bulletin is being revised to update the model years and vehicles and add additional information. Please discard Corporate Bulletin Number 02-08-42-001 (Section 08 - Body and Accessories).

The bulletin is being issued to make dealers and customers aware of chemical damage that may be caused to exterior polycarbonate headlamp lenses. Most late model vehicles have these types of headlamp lenses. This material is used because of its temperature and high impact resistance.

A variety of chemicals can cause crazing or cracking of the headlamp lens. Headlamp lenses are very sensitive. Care should be exercised to avoid contact with all exterior headlamp lenses when treating a vehicle with any type of chemical, such as those recommended for rail dust removal. Rubbing compound, grease tar and oil removers, tire cleaners, cleaner waxes and even car wash soaps in too high a concentration may also attribute to this condition. This could result in the need to replace the entire headlamp housing.

Also, crazing or deformations of the lens may occur if a shop mat or fender cover is draped over the fender and covers a portion or all of the headlamp assembly while the DLR or headlamps are on. This action restricts the amount of heat dissipated by the headlamps.

Once a heat build-up is generated by the headlamp, a degradation of the headlamp lens begins. This degradation of the lens can be unnoticeable at first and eventually manifest as spider cracks. In more extreme cases, it will begin to melt the lens of the headlamp.





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