Dorman OE Solutions Engine Coolant Reservoir for 1994-2005 Chevrolet GMC Oldsmobile 603-111

Non-pressurized engine coolant reservoir for 1994-2005 Chevrolet GMC and Oldsmobile vehicles used to replace cracked or leaking factory overflow tanks.

Built to meet the manufacturer's design intent for reliable service, this unit is constructed from quality materials engineered to withstand underhood heat and engine vibration while matching the original part's fit and function.

Key Features

• Direct replacement for specific General Motors part numbers including 12380436 and 15075570
• Manufactured from durable materials designed to resist thermal stress and cracking
• Engineered to match OE form, fit, and function for seamless installation
• Non-pressurized design consistent with original equipment specifications
• Validated through testing to ensure dependable performance

Benefits

• Restores proper coolant capacity and prevents overheating issues
• Eliminates leaks caused by aged or damaged factory reservoirs
• Reduces the risk of repeat repairs with robust construction
• Ensures a smooth installation process with direct-fit geometry
• Provides a cost-effective solution backed by decades of aftermarket experience

Application

Ideal for owners of older Chevrolet, GMC, and Oldsmobile trucks and SUVs needing to replace a failed coolant overflow tank to maintain engine temperature regulation.

Fitment Notes

• Compatible with select 1994-2005 Chevrolet models
• Compatible with select 1994-2005 GMC models
• Compatible with select 1996-2001 Oldsmobile models
• Verify vehicle compatibility using part number 603-111 before purchase

Why Choose Dorman - OE Solutions?

• Dorman parts are engineered as direct-fit replacements designed to match OE form, fit, and function
• Backed by over 100 years of automotive aftermarket experience and a focus on durability
• Built with quality materials to stand up to daily driving demands

What's in the Box

• 1 Engine Coolant Reservoir

Item Dimensions

• Length: 17.5 inches
• Width: 12.7 inches
• Height: 8.3 inches
• Weight: 4.0 lbs