S2607000003 Service Bulletin/Repair Instructions

Case Number: S2607000003

Release Date: February 2026

Symptom/Vehicle Issue: GMET4 DOHC Water Pump Coolant Leak Inspection

Models: 2024 - 2026 – Wrangler (JL/J6), Grand Cherokee (WL), Tonale (GC), Hornet

(GG), Commander (H1), Compass (MP/M1), Giulia (GA), Stelvio (GU)

Customer Complaint/Technician Observation: The customer’s complaint may

include coolant odor or observation of fluid leakage under the vehicle.

Discussion: REVIEW THE FOLLOWING INSPECTION POINTS TO IDENTIFY ALL

POTENTIAL LEAK SOURCES IN THE ENGINE COMPARTMENT BEFORE

PERFORMING PARTS REPLACEMENT.

Symptom/Vehicle Issue: Suspected Engine Coolant Leak

Check the coolant level of the suspected vehicle before starting the engine:

• If the coolant level is significantly reduced:

▪ Perform visual inspection of the entire engine cooling components using UV

light (including all cooling system hoses, hot bottle/coolant reservoir/expansion

tank, radiator, HVAC heaters, etc):

▪ If the leak source is identified, please proceed with the leaked component

replacement.
This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online

does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear

to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the

appropriate course of action.
Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no

solution is found

Stellantis US LLC
Version 4.5 06/08/2022
Coolant leaks can originate from various pump interfaces:

A. Pump to Block interface

B. Internal Pump gasket

C. Inlet pipe to pump interface

D. Pump weep hole

E. Inlet pipe nipple
Inspection

Action

Evidence of coolant leak at

Replace gasket and reuse pump

interface

Gasket damage

Possible Oil at interface

No damage to pump operation

Damage to pump operation

Replace pump

Internal pump gasket

Evidence of coolant originating

Replace pump

from pump housing to cover

interface

Inlet pipe to pump interface Evidence of coolant leak

Replace inlet tube and gasket

Pump Weep Hole

Evidence of ‘wet’ coolant at

Replace pump

interface

Inlet Pipe Nipple

Evidence of coolant around

Replace inlet pipe and gasket

interface between nipple and inlet

pipe
Leak Location

A. Pump to Block interface
B.

C.

D.

E.
This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online

does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear

to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the

appropriate course of action.
Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no

solution is found

Stellantis US LLC
Version 4.5 06/08/2022
A. Coolant Leak Between Pump and Block:

• Leak at block interface is likely due to gasket damage

• Inspect gasket – If gasket is broken, torn, split, or has lost compression

Replace gasket with new

• If pump spins without obvious sticking, pump should be reused, otherwise replace

entire pump assembly
Gasket - Damage

B. Internal Water Pump Gasket:

• If leak appears to originate at internal gasket – Replace with new pump assembly
This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online

does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear

to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the

appropriate course of action.
Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no

solution is found

Stellantis US LLC
Version 4.5 06/08/2022
C. Inlet Pipe to Pump Interface:

• Leak at inlet pipe interface is likely due to loss of torque of fasteners

• If pump spins without obvious sticking, pump should be reused, otherwise replace

entire pump assembly along with Inlet Pipe assembly.
This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online

does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear

to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the

appropriate course of action.
Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no

solution is found

Stellantis US LLC
Version 4.5 06/08/2022
D. Water Pump Weep Hole:

New Vehicle (<500miles)/New Water Pump Inspection:

• Trace coolant or residue may be found at the weep chamber plug. The presence of

trace coolant residue does not indicate a failed pump. The presence of liquid

coolant is unacceptable at any time.

• If coolant is dripping from the weep chamber:

o Raise the vehicle.

o Verify that the coolant is effectively dripping from the weep chamber.

o Run the engine at idle and perform repeated speed variations between 2000

and 4000 rpm.

o Maintain this procedure for 15 minutes.

• If after 15 minutes the coolant is still dripping:

o The water pump must be replaced (possible permanent damage to the

dynamic seal).

o If the coolant stops dripping:

o No further action is required.

o Remove coolant traces with a towel from the WP

o The vehicle can be released/returned to the customer.
This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online

does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear

to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the

appropriate course of action.
Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no

solution is found

Stellantis US LLC
Version 4.5 06/08/2022
Customer Vehicles (>500 miles)/Original Water Pump:

• Trace coolant or residue may be found at the weep chamber plug. The presence

of trace coolant residue does not indicate a failed pump. The presence of liquid

coolant is unacceptable at any time. If dripping coolant or traces of liquid coolant

at the weep chamber are found, replace the pump.

*** Note: Some coolant residues may be found at the water pump weep hole plug area

which may be normal, but coolant should not be dripping from this location as in the

following picture:
OK PUMP:

-
The coolant leak cannot be repeated

Less contamination range around weep hole

NO wetness without contamination when

contacting the leak marks with paper towel

NO coolant dripping frome the pump after

starting the engine

Compare the coolant level before engine on

and 10 minutes after with no coolant

decrease
NOT OK PUMP:

-
The coolant leak is repeated

Wetness when contacting the leak marks

with paper towels

Coolant dripping from the pump when Engine

running
This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online

does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear

to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the

appropriate course of action.
Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no

solution is found

Stellantis US LLC
Version 4.5 06/08/2022
E. Inlet pipe Nipple:

• If nipple interface area shows signs of coolant pooling or dripping replace inlet pipe

assembly

• If interface shows signs of coolant pooling or dripping – replace Inlet Pipe Assembly
This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online

does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear

to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the

appropriate course of action.
Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no

solution is found

Stellantis US LLC
Version 4.5 06/08/2022
When a water pump is identified as defective, please submit a DID-I using the Quick Incident

Report (QIR) button in Service Library. Please include pictures showing the source of the leak.

See a screen shot below from the QIR system in Service Library for reference.

NOTE: Please document and apply the appropriate Labor Operation Procedure (LOP) for the

repair performed, as this information helps engineering accurately identify root causes and

improve future service processes.
This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online

does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear

to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the

appropriate course of action.
Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no

solution is found

Stellantis US LLC
Version 4.5 06/08/2022

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