NHTSA ID Number: 11028742
Manufacturer Communication Number: S2607000002
TSB/Document Date: 2026-02-12
Summary
Hemi Water Pump Coolant Leak Inspection
Case Number: S2607000002
Release Date: February 2026
Symptom/Vehicle Issue: Hemi Water Pump Coolant Leak Inspection
Models: 2023 - 2026 – Ram
3500 (D2), 3500 Cab Chassis (DD), 3500 Cab Chassis
(DF), 2500 (DJ), 4500/5500 Cab Chassis (DP), 1500 (DT), Cab Chassis MEX (DX),
Wrangler (JL), Durango (WD), Grand Cherokee (WL), Wagoneer/Grand Wagoneer
(WS), Challenger (LA), Charger (LB), Charger (LD), 300 (LX)
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.
NOTE: If water pump weep hole has dry coolant traces, please clean these
traces with a towel, and proceed with the Pressurized Coolant System
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
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Inspection process in the Cooling Diagnosis and Testing Procedures found in
Service Library.
***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.
***NOTE: The presence of coolant residue in the weep hole does not indicate that the pump
is bad. The system pressurization test must be performed to make that determination.
Upon initial inspection, trace coolant or residue may be found at the weep plug. The presence
of trace coolant does not necessarily indicate a failed pump. The presence of liquid coolant is
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
unacceptable at any time. If liquid coolant is observed at the weep plug or dripping from the
weep hole during initial inspection or during the pressurization test, replace the pump.
• If the leak source is not identified or it is not clear, please proceed with Pressurized
Coolant System Inspection process in the Cooling Diagnosis and Testing Procedures
found in Service Library.
• If the coolant level is OK, proceed with identifying coolant traces and clean the area that
has them with a towel:
▪ If the towel is continuously getting wet (active leak) you have identified the
leak source. Please proceed with the leaked component replacement.
▪ If the towel is not getting continuously wet when cleaning, the coolant leak is
inactive. Proceed with the Pressurized Coolant System Inspection process in
the Cooling Diagnosis and Testing Procedures found in Service Library.
Proceed with the Pressurized Coolant System Inspection process in the Cooling Diagnosis and
Testing Procedures found in Service Library.
Perform visual inspection of the entire cooling system under pressure using UV light.
NOTE: If the vehicle has been filled with MOPAR 10yr coolant (purple), the coolant will glow
orange under UV light. If the coolant fluorescence has worn off or if unsure about what
coolant is in use, add Leak Detection Additive to the cooling system as directed in the Cooling
Diagnosis and Testing Procedures (Coolant Leaks) found in Service Library before performing
UV light inspection.
The visual inspection for leaks should include the following coolant system components:
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
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Radiator
Hot Bottle/Coolant Reservoir/Expansion Tank
Front Cover
Cylinder Head Gasket
Cylinder Block
Cylinder Head
EGR Cooler (if equipped)
EGR Coolant Tubes (if equipped)
Engine Oil Cooler (if equipped)
Engine Oil Cooler Coolant Tubes (if equipped)
HVAC Heaters
HVA Heaters Coolant Lines
Transmission Oil Cooler (TOC) Coolant Lines (if equipped)
All Cooling System Hoses, Gaskets and Connections
Water Pump Assembly:
▪ Water Pump Housing
▪ Water Pump Weep Hole
▪ Water Pump Heater Tube
▪ Water Pump Gasket
▪ Water Pump Pipe
▪ Engine Coolant Temperature Sensor
▪ Thermostat Housing & Gasket
NOTE: If coolant residue is found at lower areas in the engine compartment, inspect the
cooling system parts located directly above to determine if they are the leak source.
WATER PUMP INSPECTION DURING PRESSURIZED COOLANT SYSTEM INSPECTION
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
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Inspect water pump assembly components as follow:
• Water pump gasket: Check the water pump / front cover joint (all the perimeter) for
leaks or coolant residue. If leak is identified, please replace only the gasket since it is a
serviceable part.
• Water pump weep hole: Check the water pump weep hole for leaks. If active leak is
identified (coolant is dripping from weep hole), please replace water 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
• Water pump heater tube: Check the water pump / heater tube connection for leaks. If
leak is identified, please replace only the Heater Tube since it is a serviceable part.
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
OK HEATER TUBE
NOK HEATER TUBE
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
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Version 4.5 06/08/2022
• Thermostat Housing & Gasket: Check the water pump / thermostat housing joint for
leaks. If leak is identified in this joint, please remove thermostat housing to inspect the
housing and thermostat gasket:
o If the housing flange is damaged and the thermostat gasket is ok, please replace
only the housing since it is a serviceable part. Note: Please reinstall thermostat
and gasket.
o If the housing is ok and the thermostat gasket is damaged, please replace only the
thermostat with its gasket since it is a serviceable part. Note: Please reinstall
thermostat housing.
o If the housing and thermostat gasket are damaged, please replace both
components since they are serviceable parts.
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
• Water pump housing: Check the water pump housing (including area behind pulley) for
leaks or coolant residue. If leak is identified, please replace only the gasket since it is a
serviceable part.
• Water pump pipe: Check the water pump pipes connection for leaks. If leak is identified,
please replace only the pipe since it is serviceable part.
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
• Engine Coolant Temperature Sensor: Check the engine coolant temperature sensor
connection for leaks. If leak is identified, please replace only the engine coolant
temperature sensor since it is serviceable part.
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 the source of the leak is identified, 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.
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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TSB/Document ID: S2607000002
Replacement Service Bulletin Number:
MFR Communication Date: 2026-02-02
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
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