Dorman HD Solutions Heavy Duty Pressurized Coolant Reservoir for International 5900 9900i Prostar 603-5105

Heavy duty pressurized coolant reservoir for International 5900 9900i and Prostar trucks used to replace cracked or leaking factory coolant tanks.

Built to meet the manufacturer's design intent for reliable service, this replacement engine coolant reservoir is manufactured from quality materials to withstand the stresses of underhood heat and engine vibration. It is engineered and manufactured to match the fit and function of the original part with a trustworthy design backed by over 100 years of automotive aftermarket experience.

Key Features

• Direct replacement for specific International Navistar heavy duty truck models
• Constructed from durable materials designed to resist underhood heat and vibration
• Engineered to match original equipment form, fit, and function
• Pressurized design maintains proper cooling system integrity
• Validated through testing to ensure dependable performance

Benefits

• Restores proper coolant capacity and prevents overheating issues
• Eliminates leaks caused by cracked or damaged factory reservoirs
• Reduces the risk of repeat repairs with robust construction
• Ensures a smoother installation with precise OE matching
• Provides long-lasting reliability for daily driving demands
• Offers a cost-effective solution backed by extensive industry experience

Application

This part is designed for fleet managers and owner-operators of International heavy duty trucks requiring a reliable fix for failed coolant storage. Common use cases include replacing reservoirs that have developed hairline fractures due to age, heat cycling, or road vibration on models like the 5900, 9900i, and Prostar.

Fitment Notes

• Fits International 5900 model years 2003 to 2009
• Fits International 9900i model years 2003 to 2018
• Fits International Prostar model years 2007 to 2020
• Replaces Navistar part numbers 3599401F94, 3599401F93, 3599401F92, 3599401F91, 2591620C91, and 3599401F95

Why Choose Dorman - HD Solutions?

• Choosing Dorman aftermarket replacement parts is a smart way to restore your vehicle with confidence, thanks to a strong focus on fit, durability, and dependable performance. Dorman parts are engineered as direct-fit replacements designed to match OE form, fit, and function, helping ensure a smoother installation and reliable results. Built with quality materials and validated through testing, they're made to stand up to daily driving demands and help reduce the risk of repeat repairs. For a long-lasting fix you can trust, Dorman delivers proven aftermarket solutions that keep your vehicle operating the way it should.

What's in the Box

• 1 PC Coolant Reservoir

Item Dimensions

• 21.0in x 13.2in x 14.7in, 6.4lbs