Dorman HD Solutions Heavy Duty Pressurized Coolant Reservoir for 2003-2009 Chevrolet GMC and 2005-2008 Isuzu 603-5601

Heavy duty pressurized coolant reservoir for 2003-2009 Chevrolet and GMC trucks plus 2005-2008 Isuzu models used to replace cracked or leaking factory overflow 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 original equipment coolant reservoirs
• Constructed from durable materials resistant to underhood heat
• Engineered to withstand engine vibration and thermal stress
• Matches OE form, fit, and function for seamless installation
• Part number 603-5601 ensures correct application identification

Benefits

• Restores proper coolant capacity and system pressure
• Prevents overheating caused by cracked or leaking tanks
• Reduces the risk of repeat repairs with robust construction
• Ensures reliable performance under daily driving demands
• Provides a cost-effective solution compared to dealer parts

Application

Ideal for owners of Chevrolet, GMC, and Isuzu heavy duty trucks experiencing coolant leaks or visible damage to the factory overflow tank who need a durable direct-fit replacement.

Fitment Notes

• Compatible with 2003-2009 Chevrolet models
• Compatible with 2003-2009 GMC models
• Compatible with 2005-2008 Isuzu models
• Replaces General Motors part number 15161670

Why Choose Dorman - HD Solutions?

• Dorman parts are engineered as direct-fit replacements designed to match OE form, fit, and function
• Built with quality materials and validated through testing for dependability
• Backed by a strong focus on fit, durability, and performance
• Helps ensure a smoother installation and reliable long-term results

What's in the Box

• 1 Engine Coolant Reservoir

Item Dimensions

• Length: 17.8 inches
• Width: 11.5 inches
• Height: 11.0 inches
• Weight: 5.2 lbs