GENERAL MOTORS
DCS7306
URGENT - DISTRIBUTE IMMEDIATELY
Date:

August 26, 2025

Subject: N252519310 - Customer Satisfaction Program
Thermostat Housing Low Torque
Models: 2025-2026 Cadillac CT4

General Motors is releasing Customer Satisfaction Program N252519310
today.

What Should Dealers Do: Dealers should review IVH or the Dealer Maxis reports
for open VINs in their inventory. Dealers can view the attached bulletin and it
will also be displayed in Service Information tomorrow.
The Stock VIN list of vehicles in dealer inventory is attached to this message.
Note: this list is only accurate at the time of report creation and all VINs should
be validated in IVH prior to repair.
For dealers with involved vehicles, a listing has been prepared and will be
available through GM Global Connect Maxis Field Action Reports or GWM Field
Action Batch Search Report. The Inventory tab of the dealer reports will contain
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 contain customer names and addresses from Motor Vehicle Registration
Records. The use of such motor vehicle registration data for any purpose other
than follow-up necessary to complete this field action may be a violation of law in
several states.

END OF MESSAGE

Customer Satisfaction Program
N252519310 Thermostat Housing Low Torque
Release Date:
Attention:

August 2025

Revision:

00

Investigate Vehicle History (IVH) in the GM Global Warranty Management system MUST always
be checked to confirm vehicle involvement and MUST be in OPEN status prior to beginning any
required inspections and/or repairs. DO NOT use Service Information with VIN search, as it will
not verify the VIN eligibility for field actions.
This program is in effect until September 30, 2027.
Model Year

Make
Cadillac

Model
CT4

From
2025

To
2026

Investigate Vehicle History (IVH) in the GM Global Warranty Management system MUST always be checked to confirm
vehicle involvement and MUST be in OPEN status prior to beginning any required inspections and/or repairs. DO NOT
use Service Information with VIN search, as it will not verify the VIN eligibility for field actions.
Condition
Correction

Certain vehicles listed above, may have a condition in which the torque on the engine thermostat
housing fasteners is low.
Dealers will inspect for engine cooling system leaks originating at the thermostat housing. If a leak is
present the thermostat housing gasket and seal will be replaced, fasteners secured to correct torque and
coolant system refilled. If leak does not exist, torque fasteners to the 10Nm.

Parts
Use the vehicles VIN and Electronic Parts Catalog if parts are required.
Warranty Information
Labor
Operation
9108013
9108014

Description
Inspect Thermostat Housing for Leaks and Retorque Thermostat
Housing Bolts
Inspect Thermostat Housing for Leaks and Replace Thermostat
Housing Gasket/Seal

Labor
Time
2.3

Trans.
Type
ZFAT

Net
Item
N/A

8.4

ZFAT

N/A

Service Procedure
1. Pressure test coolant system and check for leaks. Refer to Cooling System Leak Testing in SI.
1.1. If any leaks are found, replace the engine coolant thermostat housing gasket/seal. Refer to Engine Coolant
Thermostat Housing Replacement in SI.
1.2. If no leaks are found, continue to step 2. Reference Engine Coolant Thermostat Housing Replacement in SI for
component views if required.
2. Remove the Intake Manifold Cover Bolt.
3. Remove the Engine Oil Filler Cap.
4. Remove the Intake Manifold Cover.
5. Install the oil filler cap after removal of the intake manifold cover to prevent debris from falling into the engine.
6. Remove the Windshield Wiper Arms - Left Side and Right Side.
6.1. Using the appropriate trim tool, remove the windshield wiper arm finish cap from the windshield wiper arm.
6.2. Remove the Windshield Wiper Arm Nuts.
6.3. Grasp the outer end of the windshield wiper arm and gently rock the arm back and forth to remove it from the
windshield wiper transmission pivot shaft.
Caution: Damage to the vehicle paint may occur if the step below is not followed.

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Customer Satisfaction Program
N252519310 Thermostat Housing Low Torque

6994645
7.

Remove the Air Inlet Grille Panel Extensions - Left Side and Right Side.
7.1. Apply two layers of masking tape as shown to prevent paint damage.
7.2. Using a suitable plastic trim tool, carefully release the air inlet grille panel extension clips.
7.3. Remove the air inlet grille panel extension from the air inlet grille panel and upper front fender.

8.

Remove the Front Compartment Side Sight Shield Retainers - Left Side and Right Side.

9.

Remove the Front Compartment Side Sight Shields - Left Side and Right Side.

10. Remove the hood rear outer air inlet seal retainers from the left and right side.
11. Remove the hood rear outer air inlet seal from the left and right side.
12. Remove the Air Inlet Grille Panel Retainers - Left Side and Right Side.
13. Remove the Air Inlet Grille Panel Extensions - Left Side and Right Side.
14. Remove the Air Inlet Grille Panel Retainers.
15. Remove the Air Inlet Grille Panels.
15.1. Disconnect the windshield washer nozzle hose from the windshield washer pump hose.
15.2. Lift the front edge of the air inlet grille panel and slide the panel forward from both hood hinges to remove.
16. Remove the Windshield Wiper System Module Shield.
17. Disconnect the windshield wiper motor electrical connector.
18. Remove the Windshield Wiper System Module Bolts.
19. Slide the windshield wiper system module inboard to release the grommet from the plenum and remove the
windshield wiper system module from the vehicle.
20. Remove the Air Inlet Deflector Water Deflector Retainers.
21. Remove the Air Inlet Deflector Water Deflector.
22. Remove the Plenum Front Panel Nuts x 3.
23. Remove the Plenum Front Panel Bolts x 3.
24. Pull the forward lamp wiring harness out from the plenum front panel.
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Customer Satisfaction Program
N252519310 Thermostat Housing Low Torque
25. Remove the Plenum Front Panel Bolts x 4.
26. Remove the Plenum Front Panel Nuts x 3.
27. Remove the Plenum Front Panel.
28. Remove the Engine Rear Noise Shield Bolt x 1.
29. Remove the Engine Rear Noise Shield Bolts x 2.
30. Unclip the Retainers.
31. Reposition the Wiring Harness.
32. Remove the Fuel Pipe Shield.
Danger: The noise cancelling foam component MUST be replaced if it has been exposed to engine fluids. Failure
to replace the noise canceling foam component that has been exposed to engine fluids may result in an engine fire
resulting in catastrophic engine damage, and possible injury or death.
33. Remove the Engine Rear Noise Shield.
34. Verify there are no leaks coming from the thermostat housing.
Caution: Use a shop towel or equivalent to cover the windshield to prevent damage when torquing bolts.

6994647

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Customer Satisfaction Program
N252519310 Thermostat Housing Low Torque

6994714
35. Torque the 3 Engine Coolant Thermostat Housing Bolts to 10Nm.
36. Reverse steps for installation.
Dealer Responsibility
All new, used, GM Certified Pre-Owned (CPO), courtesy transportation vehicles, dealer shuttle vehicles, CarBravo, etc.
in dealers' possession and subject to this field action 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 Pre-Owned (CPO) vehicles currently in the dealers’ inventory within the SHIFT Digital system 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 SHIFT Digital system, or once again be used in the Courtesy Transportation Program.
Dealers are to service all vehicles subject to this program at no charge to customers, regardless of mileage, age of vehicle,
or ownership, through the end date as noted in the Attention box. Customers who have recently purchased vehicles sold
from your vehicle inventory, and for which there is no customer information indicated on the involved vehicle listing, are
to be contacted by the dealer. Arrangements are to be made to make the required correction according to the instructions
contained in this bulletin. A copy of the customer letter is provided in this bulletin for your use in contacting customers.
Program follow-up cards should not be used for this purpose, since the customer may not as yet have received the
notification letter.
In summary, whenever a vehicle subject to this program enters your vehicle inventory or is in your facility for service
through the end date as noted in the Attention box, you must take the steps necessary to be sure the program correction
has been made before selling or releasing the vehicle.
Dealer Reports – For USA
For dealers with involved vehicles, a listing has been prepared and will be available through GM Global Connect Maxis
Field Action Reports or GWM Field Action Batch Search Report. The Inventory tab of the dealer reports will contain
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 contain customer names and addresses from Motor Vehicle
Registration Records. The use of such motor vehicle registration data for any purpose other than follow-up necessary
to complete this field action may be a violation of law in several states.
Courtesy Transportation
USA - For repairs covered under this Field Action, Courtesy Transportation can be made available ONLY if the
customer/vehicle qualify for Courtesy Transportation per Bulletin 07-00-89-037.
Canada - Courtesy transportation is available for customers whose vehicles are involved in a product program and still
within the warranty coverage period. See General Motors Service Policies and Procedures Manual for courtesy
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Customer Satisfaction Program
N252519310 Thermostat Housing Low Torque
transportation program details. Refer to the most current Home Office Letter (YYYY-604) on the Courtesy
Transportation Program for details.
Customer Notification
USA & Canada - General Motors will notify customers of this program on their vehicle (see copy of sample customer letter
included with this bulletin).
Export - Letters will be sent to known owners of record located within areas covered by the US National Traffic and Motor
Vehicle Safety Act. For owners outside these areas, dealers should notify customers using the attached sample letter.

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 tools, equipment, 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 dealer for information on whether your
vehicle may benefit from the information.

We Support
Voluntary Technician
Certification

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Customer Satisfaction Program
N252519310 Thermostat Housing Low Torque

This notice applies to your vehicle, VIN: ________________________________
Dear General Motors Customer:
We have learned that your GM vehicle may have a condition in which the torque on the engine thermostat housing
fasteners is low.
Your satisfaction with your vehicle is very important to us, so we are announcing a program to prevent this condition or,
if it has occurred, to fix it.
What We Will Do: Your GM dealer will inspect for engine cooling system leaks originating at the thermostat housing. If
a leak is present, the thermostat housing gasket and seal will be replaced, fasteners secured to correct torque and
coolant system refilled. If a leak does not exist, fasteners will be torqued. This service will be performed for you at no
charge until September 30, 2027. After that, any applicable warranty will apply.
What You Should Do: To limit any possible inconvenience, we recommend that you contact your dealer as soon as
possible to schedule an appointment for this repair.
You may schedule your vehicle for repair using the QR code below. For more information about your vehicle, or if you
have questions or concerns that your dealer is unable to resolve, please visit gm.com/service. You can also use your
preferred voice assistant (for example, “Alexa, go to gm/com/service”), or call the Buick, Chevrolet or GMC Customer
Assistance Center at 1-866-467-9700. For Cadillac, please call 1-800-333-4223.
For the hearing or speech impaired, please contact our Customer Assistance Center using the Telecommunication
Relay Service by dialing 711 then providing the appropriate Customer Assistance Center number for your vehicle.
We truly appreciate you taking the time to remedy your vehicle as we know your time is valuable. We want you to know
that we will do our best, throughout your ownership experience, to ensure that your GM vehicle provides you many
miles of enjoyable driving.
Neelie O’Connor
Global Executive Director
Customer Experience Operations
Scan here to
locate a dealer.

N252519310

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