2008-2021 Toyota Models Water Pump Leak Inspection and Diagnostic Tips T-SB-0103-20 (Warranty Policy 4.21)

MG

Moderator
Please see T-SB-0103-20

Also see T-SB-0117-11

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Introduction:
This Service Bulletin provides updated non-electric water pump leak inspection and diagnostic tips for some 2008 – 2021 model year Toyota vehicles.

APPLICABLE WARRANTY:
Warranty coverage is based on the failed component. Please refer to the Warranty Policy and Procedures Manual and the Powertrain Parts List for specific coverage. Warranty application is limited to occurrence of the specified condition described in this bulletin.

Warranty and Claim Submission: Warranty Policy 4.21
* ANY leak repair to be performed under warranty requires photo documentation of the active leak.
* This documentation showing the cause of the defect MUST be created prior to the start of the repair and attached to the warranty claim.
* Photos MUST be clear and provide perspective image(s) that identify the vehicle identification number (VIN) and the affected component(s), and close-up image(s) that illustrate the defect or condition.
* For additional information regarding application and eligibility, please reference Warranty Policy 4.21.

Temporary and Active Leaks:
Water pump replacement is NOT necessary for a temporary leak condition. The water pump should be replaced for an active leak condition. Examples of both conditions are shown below:
As the water pump assembly rotates, a small amount of engine coolant is discharged to cool and lubricate the sliding surface of the mechanical seal and evaporates.
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If debris becomes lodged between the mating ring and seal ring, a small gap is formed. This allows coolant to bypass the mechanical seal, flow into the fluid catch pocket, and drain out of the weep hole. This condition is temporary and will no longer be present once the debris breaks up or works its way out of the seal.

Water Pump Replacement Diagnostic Procedure:
1. Confirm if there are leaks from other areas of the cooling system not including from the water pump assembly.
Are ANY leaks present in the cooling system other than from the water pump?
YES — Continue leak diagnosis using the applicable model and model year Repair Manual and correct any other cooling system leaks BEFORE proceeding.
NO — Continue to step 2.

2. Is the coolant level below the “low” indicator on the reservoir and does the water pump appear to be actively leaking?
YES — Replace the water pump. Refer to the applicable model and model year Repair Manual.
NO — Continue to step 3.

3. Does the water pump pulley/bearing have excessive free play or does NOT turn smoothly?
YES — Replace the water pump. Refer to the applicable model and model year Repair Manual.
NO — Continue to step 4

4. A paper towel should be used to determine if a leak is current or was temporary due to debris that has now cleared. Apply a dry paper towel to the coolant deposits around the water pump. If the paper towel remains dry, the leak was temporary and the water pump does NOT need to be replaced. If the paper towel becomes wet with coolant, the leak is active and the water pump should be replaced.

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Is the paper towel wet with coolant?
YES — Replace the water pump. Refer to the applicable model and model year Repair Manual.
NO — No active leak is present. Confirm the coolant level in the reservoir is correct, adjust as necessary, and return the vehicle to the customer.
 
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