19NA104

Bulletin No.:
Service Bulletin
Date:
19-NA-104
November, 2021
INFORMATION
Subject:
Brand:
Buick
Cadillac
Chevrolet
GMC
Steam/Vapor Coming from Front Grille or Radiator Area
Model:
GM
Passenger
Cars and
Trucks
Model Year:
VIN:
from
to
from
to
2014
2022
—
—
Involved Region or Country
Condition
Engine:
Transmission:
All
All
North America, Europe, Russia, Middle East, Israel, South America, Japan, China,
Thailand, Egypt, Africa
Note: The video above shows an example of the Cadillac XT4 model. On other vehicles,
the condition would look similar, except for Chevrolet Corvette on which the steam would
be seen leaving the hood vent.
Some customers may comment that steam is coming from the front grille at idle, or on
seeing vapor coming from the radiator after car washes.
Cause
The cause of the condition may be the result of rain or car wash runoff water reaching the
condenser, radiator and fan module (CRFM). The water can become vaporized and, with
the right weather conditions, can become visible condensate.
Correction
Please communicate to the customer that the CRFM system is functioning as designed,
and this is a normal condition of their vehicle. Please share this information with the
customer, including a copy of this bulletin.
Version
4
Modified
Released May 09, 2019
June 10, 2019 – Added the 2014-2019 Model Years, all GM Corporate Wide Models,
updated the Involved Region or Country section and added a Note to the Condition.
February 28, 2020 – Added the 2020 Model Year.
November 08, 2021 – Added the 2021-2022 Model Years.
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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