Coolant Reservoir / Expansion Tank – N5346001 / 603-5403 | Kenworth & Peterbilt

Coolant Reservoir / Expansion Tank – N5346001 / 603-5403 | Kenworth & Peterbilt

Replace your cracked or leaking coolant reservoir with this high-quality OEM-style expansion tank. Designed for reliable coolant storage and pressure regulation, this direct-fit replacement is manufactured from durable, heat-resistant plastic for long service life in heavy-duty truck applications.

Specifications

Fitment

Kenworth

• 2008–2015 T600

• 2008–2017 T660

• 2008–2018 T800

• 2008–2018 W900

Peterbilt

• 2010–2018 348

• 2008–2018 365

• 2008–2018 367

• 2008–2014 377

• 2008–2017 382

• 2008–2016 384

• 2008–2014 385

• 2008–2016 386

• 2008–2015 388

• 2008–2019 389

Important Note

• Replaces Part Numbers N5346001 and 603-5403.

• Please verify the part number and compare your original coolant reservoir before ordering to ensure proper fitment.

Warranty & Liability Disclaimer

This aftermarket replacement coolant reservoir is designed to meet or exceed OEM fitment standards. Professional installation is recommended. Warranty covers manufacturing defects only and does not cover damage caused by improper installation, misuse, accidents, or normal wear.

California Proposition 65 Warning

⚠ WARNING: This product may expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.