Dorman 603-102 Engine Coolant Reservoir - Front

Overview of Dorman Engine Coolant Reservoir 603-102

The Dorman 603-102 engine coolant reservoir is designed for reliable cooling system performance in select Cadillac, Chevrolet, GMC, and Hummer vehicles. This clear plastic reservoir includes a spring loaded twist cap and mounting brackets for secure installation.

• Constructed from durable plastic material
• Clear color for easy coolant level monitoring
• Dimensions: 235mm length x 186mm height
• Includes spring loaded twist cap rated for 15 psi pressure
• Mounting brackets included; one mounting hole
• Pressurized reservoir design
• Package contains one coolant reservoir and one cap

Detailed Product Description

The Dorman 603-102 engine coolant reservoir is engineered to meet the cooling system requirements of various GM vehicles, including Cadillac Escalade models, Chevrolet Silverado trucks, GMC Sierra series, and Hummer H2. Made from high-quality plastic, the reservoir is clear to allow for quick visual inspection of coolant levels without removal. It measures 235mm in length and 186mm in height, fitting precisely in the designated engine bay space.

This reservoir features a spring loaded twist cap that maintains system pressure up to 15 psi, helping to prevent coolant loss and overheating. The pressurized design supports efficient coolant circulation and system integrity. Included mounting brackets and a single mounting hole facilitate straightforward installation and secure fitment.

Compatible Vehicles and Applications

• Cadillac Escalade, Escalade ESV, Escalade EXT
• Chevrolet Avalanche 1500, Avalanche 2500, Silverado 1500, Silverado 2500, Silverado 3500, Suburban 1500, Suburban 2500, Tahoe
• GMC Sierra 1500, Sierra 2500, Sierra 3500, Yukon, Yukon XL 1500, Yukon XL 2500
• Hummer H2

Common Issues Addressed by This Coolant Reservoir

• Coolant leaks due to cracked or damaged reservoir tanks
• Overheating caused by loss of coolant pressure
• Difficulty monitoring coolant levels with opaque reservoirs
• Failed or missing reservoir caps leading to pressure loss
• Improper fitment or mounting instability in cooling system

Installation Notes and Tips

• Ensure engine is cool before removing the old reservoir to avoid injury
• Use included mounting brackets for secure installation
• Check for any damaged hoses or fittings during replacement
• Fill reservoir with manufacturer-recommended coolant after installation
• Verify cap is properly tightened to maintain system pressure

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM specifications for fit, form, and function. The 603-102 engine coolant reservoir undergoes quality control testing to ensure durability and performance. While specific warranty details may vary, Dorman typically offers limited warranties covering defects in material and workmanship.