Technical Service Bulletin (TSB)
Coolant Contamination / Coolant System Flush
REFERENCE:

TSB: 07-007-24
GROUP: 07 - Cooling

Date:

August 17, 2024

REVISION:

VEHICLES
AFFECTED:

2023 - 2024 (DS) RAM 1500 Pickup
MARKET APPLICABILITY:
This bulletin applies to vehicles built on and after June 01, 2023 (MDH
MEA
NA
0601XX) and on and before February 16, 2024 (MDH 0216XX) equipped
SA
IAP
with a 3.6L V6 24V VVT Engine (Sales Code ERB).
EE

CH

CUSTOMER
SYMPTOM:

Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must
exhibit/set the following Diagnostic Trouble Code (DTC):
● P26A3 - Engine Coolant Bypass Valve A Range-Performance.

CAUSE:

Contamination from stop leak pellets causing valve failure

REPAIR SUMMARY:
This bulletin involves flushing the cooling system and replacing the Three-way coolant valve.
CLAIMS DATA:

Labor Operation No:
07-46-01-96

Failure Code

Labor Description
Coolant Valve, 3 Way Replace, Includes Circuit
Test and Power Flush
Procedure
(1 - Semi-Skilled)
ZZ

Skill Category
7 - Cooling

Part No.
52014892AC
68163849AB

Description
Valve, Coolant 3-Way
Engine Coolant

Labor Time
1.2 Hrs.

Service Action

SPARE PARTS:

Qty
1
(AR)

Notes

DIAGNOSIS:
Using a Scan Tool (wiTECH) with the appropriate Diagnostic Procedures available in DealerCONNECT/
Service Library, verify all related systems are functioning as designed. If DTCs or symptom conditions,
other than the one listed are present, record the issues on the repair order and repair as necessary before
proceeding further with this bulletin.

B07 FSAR-RSU-4358

-2-

SPECIAL TOOLS/EQUIPMENT:

Description
wiTECH or Equivalent

Ref. No.
–

Notes
–

REPAIR PROCEDURE:
1. Scan for other DTCs.
2. Are there any other LIN BUS DTCs?
● YES>>> Perform the additional diagnostic procedures. Then proceed to Step 3.
● NO>>> Proceed to Step 3.
3. Disconnect the Three-Way Valve harness connector. Check the (Z908) ground circuit for high resistance
by load testing the circuit. Refer to the detailed service procedures listed in DealerCONNECT>Service
Library>Service Info>under: 29 - Non-DTC Diagnostics / Circuit Testing Procedures / Standard Procedure.
4. Did the harness circuit pass the load test?
● YES>>> Proceed to Step 5.
● NO>>> Repair the ground circuit and perform the Powertrain Verification Test. Refer to the detailed
service procedures listed in DealerCONNECT>Service Library>Service Info>under: 28 - DTC Based
Diagnostics /Module, Powertrain Control (PCM) - Standard Procedure.
5. Drain the cooling system and dispose of the coolant. Refer to the detailed service procedures listed
in DealerCONNECT>Service Library>Service Info>under: 09 - Engine, 3.6L / Cooling System / Engine
Cooling / Standard Procedure / Cooling System Draining. Do not reuse as this will re-introduce the
impurities that may have caused the valve failure.
6. Backflush Auxiliary Heat Exchangers (Heater Core, Transmission Oil Heater, Engine Oil Cooler) by
disconnecting hoses at the Three-Way Valve and the water pump Fig. 1.

Fig. 1
Cooling System
1 - Heater Core Supply
2 - Transmission Oil Heater Supply
3 - Three way Valve Coolant Inlet
4 - Auxiliary Heater Exchange Return Hose

-3-

B07 FSAR-RSU-4358

7. Pressure flush from the location at hose four with a pressure no greater than 138 KPA (20 PSI).
CAUTION!!
Do not exceed 138 KPA (20 PSI) when flushing.
8. Continue flushing with bursts of pressure until fluid runs out clear from all hoses.
9. Block connections one, two and three (pinch hoses shut or plug with caps) and insert the flushing gun into
hose four again. Flush with pressure from this point only while allowing drainage from point five (water
pump) Fig. 2.
10. Leaving connections one, two, three and four DISCONNECTED, disconnect points five and six to perform
a reverse flush of the radiator Fig. 2.
11. Insert the flushing gun into connection five hose to flush the radiator. Flush from this point only while
allowing drainage from point six Fig. 2.
12. Reconnect hose five, disconnect hose seven, and insert flushing tool into hose seven to complete the
engine flush.

Fig. 2
Flush Points
1 - Heater Core Supply
2 - Transmission Oil Heater Supply
3 - Three way Valve Coolant Inlet
4 - Auxiliary Heater Exchange Return Hose
5 - Lower Radiator Hose At Water Pump
6 - Upper Radiator Hose At Radiator
7 - Lower Radiator Hose At Radiator

13. Replace the Three-way coolant valve. Refer to the detailed service procedures listed in
DealerCONNECT>Service Library under: 07 - Differential and Driveline / Valves / Removal and
Installation / Three-Way Coolant Valve.
14. Refill system with NEW coolant. Refer to the detailed service procedures listed in
DealerCONNECT>Service Library under: 09 - Engine, 3.6L / Cooling System / Engine Cooling / Standard
Procedure / Cooling System Fill.
15. Clear all DTCs that have been set.
POLICY:
Reimbursable within the provisions of the warranty.
This bulletin is supplied as technical information only and is not an authorization for repair. No part of this publication may be reproduced, stored in a retrieval system, or
transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise, without written permission of FCA US LLC.