Service Update N202321920 Engine Coolant Inlet Pipe – 2021 Cadillac Chevrolet GMC

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GLOBAL SAFETY FIELD INVESTIGATIONS
DCS5619
URGENT – DISTRIBUTE IMMEDIATELY
Date: December 21, 2020
Subject: N202321920 – Service Update
Engine Coolant Inlet Pipe
Models: 2021 Cadillac XT4 and XT5
2021 Chevrolet Trailblazer
2021 GMC Acadia
To: All General Motors Dealers
General Motors is releasing Service Update N202321920 today. The total
number of U.S. vehicles involved is approximately 12. Please see the
attached bulletin for details.
Global Warranty Management (GWM)
The Required Field Action section on the Investigate Vehicle History (IVH) screen will
be updated December 22, 2020 or sooner. A list of involved vehicles in dealer new
inventory is attached to this message. Please hold all warranty transactions until IVH
has been updated.
END OF MESSAGE
GLOBAL SAFETY FIELD INVESTIGATIONS
Service Update
N202321920 Engine Coolant Inlet Pipe
Release Date: December 2020 Revision: 00
Attention: This service update includes vehicles in dealer inventory and customer vehicles that return to the
dealership for any reason. This bulletin will expire at the end of the involved vehicle’s New Vehicle Limited
Warranty period.
Make Model
Model Year
From To RPO Description
Cadillac XT4
2021
2021
Cadillac XT5
Chevrolet Blazer
GMC Acadia
Involved vehicles are marked “open” on the Investigate Vehicle History screen in GM Global Warranty Management
system. This site should always be checked to confirm vehicle involvement prior to beginning any required inspections
and/or repairs.
Condition A small number of 2021 model year Cadillac XT4 and XT5, Chevrolet Blazer and GMC Acadia vehicles
may have a coolant inlet pipe that may present an obstructed threaded hole for the coolant temp sensor
which could result in the check engine light coming on or a potential coolant leak.
Correction Dealers are to replace the coolant inlet pipe and temperature sensor.
Parts
Quantity Part Name Part No.
1 Engine Coolant Thermostat Inlet Pipe 55507975
1 Engine Coolant Temperature Sensor 55488246
1 Gasket, Thermostat Inlet Pipe 55504553
1 Engine Coolant 12378390
US
10953456
CA
1 Exhaust Pipe Clamp 11603519
1 Catalytic Converter Gasket 55502444
2 Exhaust Muffler Gasket 22816982
It is estimated that there are only 15 involved vehicles that will require parts being replaced. Due to the small number
of vehicles anticipated that will need this repair and the limited initial parts availability, dealers are encouraged
not to order these parts for use as shelf stock.
Reminder: Parts may be removed from Retail Inventory Management (RIM). Dealers should review the affected parts
to confirm RIM managed status. Parts may have quantity limiters in effect.
Warranty Information
Labor
Operation Description
Labor
Time
Trans.
Type
Net
Item
9105491 Inspect Only – No Further Action Required 0.6 ZFAT N/A
9105492 Repair (includes inspection)
Acadia
Blazer
XT5
XT4
XT4 (AWD)
2.5
2.2
2.1
2.2
2.4
ZFAT N/A
Service Procedure
1. Perform a cooling system leak check per Coolant System Leak Testing in SI.
• If the cooling system maintains the rated pressure for at least 2 minutes, no further action is required.
• If the cooling system does not maintain the rated pressure for at least two minutes, proceed to step 2.
2. Locate the coolant temperature sensor in the engine coolant thermostat housing inlet pipe at the front of the engine.
Service Update
N202321920 Engine Coolant Inlet Pipe
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3. Pressurize the cooling system again with the EN-24460-A Cooling System Pressure Tester per Coolant System
Leak Testing in SI and observe the coolant temperature sensor to see if it is leaking.
• If the coolant temperature sensor IS leaking, replace the Engine Coolant Thermostat Housing Inlet Pipe.
Refer to Engine Coolant Thermostat Housing Inlet Pipe Replacement (LSY) in SI.
• If the coolant temperature sensor is NOT leaking, perform further diagnosis and/or repairs under
warranty on a separate line. No further action is covered by this field action.
Dealer Responsibility
Whenever a vehicle subject to this service update enters your vehicle inventory or is in your facility for service in the
future, and the vehicle is still covered under the New Vehicle Limited Warranty, you must take the steps necessary to be
sure the service update correction has been made before selling or releasing the vehicle.
All new, used, GM Certified Used, courtesy transportation vehicles, dealer shuttle vehicles, etc. in dealers’ possession
and subject to this bulletin must be held and inspected/repaired per the service procedure of this bulletin before customers
take possession of these vehicles. Involved vehicles must be held and not delivered to customers, dealer-traded,
released to auction, used for demonstration, or any other purpose.
All GM Certified Used vehicles currently in the dealers’ inventory within the Certified Pre-Owned Inventory System
(CPOIS) will be de-certified and must be held and remedied per the service procedure in this bulletin. Upon submitting
an accepted/paid warranty transaction in the Global Warranty Management (GWM) system, the vehicle can be re-certified
for sale within the CPOIS system, or once again be used in the CTP program.
Dealer Reports
The Inventory tab of the Open Vehicle Report will contain Service Update Bulletin VINs that apply to this field action.
This information is intended to assist dealers with the PROMPT COMPLETION of these vehicles. The Customer In-
Service tab will not contain Service Update Bulletin VIN data because the intent of a Service Update Bulletin is to not
inconvenience a customer with a special trip for service. Service Update Bulletins are to be completed when the
customer is in for a regularly scheduled visit.

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