GDUKOP Engine Coolant Expansion Reservoir Tank w/ Cap — Direct-Fit PA Plastic

The GDUKOP 603-054 engine coolant expansion reservoir tank with cap is a direct-fit replacement reservoir designed to restore proper coolant overflow storage and pressure relief for compatible Cadillac, Chevrolet and GMC models.

When an aging or cracked coolant reservoir starts leaking or cannot hold pressure, your engine cooling system loses effectiveness. This replacement tank is molded from heat-resistant PA plastic and ships with a matching cap so you can return a 2007–2018 GM truck or SUV to reliable cooling operation without expensive dealer downtime. Below you’ll find quick answers to common buyer questions, clear specifics on fit and function, plus a brief summary of who benefits most from this part.

Which GM vehicles will this reservoir fit?

This expansion tank fits a wide range of GM full-size trucks and SUVs. Fitment covers many model years for Cadillac Escalade, Chevrolet Silverado, Suburban, Tahoe, Avalanche, and GMC Sierra and Yukon lines—confirm fit with your VIN or the OE numbers listed below.

• Cadillac: Escalade / Escalade ESV (2007–2014)
• Chevrolet: Silverado 1500 (2007–2013); Silverado 2500/3500 (2010–2013); Suburban (2007–2013 and 2016); Tahoe (2007–2014); Avalanche/Cheyenne (2007–2013)
• GMC: Sierra / Sierra 1500 (2007–2013); Sierra 2500/3500 (2007–2018); Yukon / Yukon XL (2007–2014)
• Replacement OE references: 603-054, 22870828, 22797286, 15833723, 13502353, 797286

How does this tank help my cooling system perform better?

The reservoir collects expanding coolant when the engine warms up and returns it to the radiator as the engine cools, maintaining the correct fluid level and reducing air introduction. Built from reinforced PA plastic, it resists high temperatures and vibration common in heavy-duty applications.

• Stores surplus coolant to prevent overflow and loss of fluid
• Maintains consistent pressure to reduce air pockets and hot spots
• Durable construction limits cracking and premature replacement
• Includes a matching cap to restore pressure sealing and venting function

What are the main technical and quality features?

GDUKOP engineered this reservoir for longevity in demanding operating conditions. The material selection and molding process prioritize thermal resistance and dimensional accuracy so the part installs like the original equipment.

• Constructed from PA (polyamide) plastic for heat and vibration resistance
• OEM-style mounting points and hose connections for straightforward installation
• Ships with a compatible cap that vents and seals correctly under pressure
• Backed by a one-year unlimited-mileage guarantee and responsive customer support

How easy is it to replace the old reservoir myself?

Replacement is typically a straightforward task for a DIYer with basic tools: drain to safe level, unclip hoses and mounting fasteners, swap the tank and reconnect hoses, then refill and bleed the cooling system per manufacturer guidance.

• Minimal mechanical skill required; common hand tools suffice
• Follow vehicle-specific bleeding procedures to remove trapped air
• Inspect hoses and clamps during swap and replace if brittle or corroded
• Test for leaks and proper coolant level after installation

Who is this for? If you own one of the compatible Cadillac, Chevrolet, or GMC trucks or SUVs and you’ve noticed coolant loss, visible cracks, cap failure, or coolant-system warnings, this GDUKOP 603-054 reservoir and cap combination offers a cost-effective, OEM-style replacement. It’s aimed at vehicle owners, independent mechanics, and fleet maintenance teams seeking a durable, direct-fit part that restores proper coolant overflow control and helps maintain engine temperature stability.