[Manitcor]

Subject: Engine Running Hot, Overheating and/or Loss of Coolant (Polish Radiator Filler Neck and Replace Radiator Cap)


Models: 1999-2000 Passenger Cars and Trucks
with Composite Radiator End Tank


Condition:
Some customers may comment on one or more of the following conditions:
Engine running hot
Engine overheating, and/or
Loss of coolant/low coolant message


Cause:
The radiator filler neck may have an imperfection in the sealing surface.


Correction:
Important
DO NOT REPLACE THE RADIATOR.


Using a piece of 400 grit wet/dry sandpaper backed with a flat piece of wood, polish the filler neck sealing surface using a circular motion.
Replace the radiator pressure cap with a cap of the same part number as shown in the GM Service Parts Catalog.


GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these 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 your GM dealer for information on whether your vehicle may benefit from the information.


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