T-SB-0087-08
June 5, 2008
Abnormal Noise from Coolant Heat Storage Water Pump
Service Category
Engine/Hybrid System
Section
Cooling
Market
USA
Applicability
| YEAR(S) | MODEL(S) | ADDITIONAL INFORMATION |
|---|---|---|
| 2004 – 2008 | Prius |
Introduction
Some 2004 – 2008 model year Prius vehicles may exhibit a “squeak” type noise during vehicle startup or shutdown. This noise can be heard coming from the coolant heat storage water pump during cold ambient temperature conditions. Use the following procedure to address this condition only if the noise is confirmed to be coming from the coolant heat storage water pump.
Production Change Information
This TSB applies to vehicles produced BEFORE the Production Change Effective VINs shown below.
| MODEL | PLANT | PRODUCTION CHANGE EFFECTIVE VIN |
|---|---|---|
| Prius | Tsutsumi | JTDKB2#U#83315752 |
Toyota Auto Body | JTDKB2#U#87710306 |
Warranty Information
| OP CODE | DESCRIPTION | TIME | OFP | T1 | T2 |
|---|---|---|---|---|---|
| EG8026 | R & R Water Pump Assembly w/Motor
& Bracket | 1.0 | 16290-21010 | 91 | 83 |
APPLICABLE WARRANTY
- This repair is covered under the Toyota Powertrain Warranty. This warranty is in effect for 60 months or 60,000 miles, whichever occurs first, from the vehicle’s in-service date.
- Warranty application is limited to correction of a problem based upon a customer’s specific complaint.
Components
Figure 1. Location of Coolant Heat Storage Water Pump
| 1 | Radiator Support Opening Cover | 6 | Water By-pass Hose |
| 2 | Clip | 7 | Coolant Heat Storage Water Pump |
| 3 | Front Fender Liner LH | 8 | Water Pump Connector |
| 4 | Engine Under Cover LH | 9 | Specified Torque |
| 5 | Heat Storage Water By-pass Hose No. 1 |
Parts Information
| PREVIOUS PART NUMBER | CURRENT PART NUMBER | PART NAME | QTY |
|---|---|---|---|
| 16290-21010 | 16290-21011
Last update on 2026-06-17 / Affiliate links / Images from Amazon Product Advertising API | Pump Assembly, Water w/ Motor & Bracket | 1 |
| 00272-SLLC2 No products found. | Same | Super Long Life Coolant (SLLC) | 1 |
Repair Procedure
- After the noise is verified to be coming from the coolant heat storage water pump, replace it with a NEW part.
Refer to the Technical Information System (TIS), applicable model year Prius Repair Manual:
- 2004 / 2005 Prius, Engine/Hybrid System – Cooling – “Coolant Heat Storage Water Pump (1NZ-FXE): Replacement”
- 2006 / 2007 / 2008 Prius, Engine/Hybrid System – Cooling – “1NZ-FXE Cooling: Coolant Heat Storage Water Pump: Removal”
- 2006 / 2007 / 2008 Prius, Engine/Hybrid System – Cooling – “1NZ-FXE Cooling: Coolant Heat Storage Water Pump: Installation”
- Road test to verify proper operation of the coolant system.
No products found.
No products found.
- Provides protection down to -34 degree fahrenheit
- Helps prevent rust and corrosion
- A patented organic acid corrosion inhibitor package to provide extended engine protection against rust and corrosion
- Contains 30 – 50 ppm of denatonium benzoate as a bittering agent
Last update on 2026-06-19 / Affiliate links / Images from Amazon Product Advertising API
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