GDUKOP Coolant Expansion Tank 603-054 for GM Trucks & SUVs — OE-Fit PA Plastic with Cap

The GDUKOP 603-054 engine coolant expansion reservoir tank with cap is a direct-replacement coolant overflow reservoir designed to restore proper coolant circulation and pressure control on compatible GM trucks and SUVs.

This replacement expansion tank is engineered to match OE fitment and function for a range of Chevrolet, GMC and Cadillac models from mid-2000s to mid-2010s. Built from heat-resistant PA-grade plastic and supplied with a matching cap, it stores excess antifreeze, relieves system pressure when temperatures rise, and returns fluid to the radiator as the engine cools—helping your cooling system run as intended without overheating or loss of coolant.

Which vehicles does this reservoir fit and how do I confirm compatibility?

The GDUKOP 603-054 is manufactured to replace factory tanks on many GM full-size pickups and SUVs. Check your vehicle’s year, make and model against the compatibility list and compare the OE part numbers on your existing tank.

• Compatible models include Cadillac Escalade/Escalade ESV (2007–2014)
• Chevrolet: Silverado 1500 (2007–2013), Silverado 2500/3500 (2010–2013), Suburban (2007–2016), Tahoe (2007–2014), Avalanche (2007–2013)
• GMC: Sierra/Sierra 1500 (2007–2018), Sierra 2500/3500 (2007–2018), Yukon/Yukon XL (2007–2014)
• Replacement OE numbers include 603-054, 22870828, 22797286, 15833723 and related IDs—match with your existing part for certainty

What materials and design features ensure durability?

This tank uses reinforced PA plastic engineered to resist high under-hood temperatures, vibration and exposure to coolant chemicals. The integrated mounting points and sealing surface are molded for a secure fit, while the included cap is selected to maintain correct pressure levels for the specified vehicles.

• Heat- and chemical-resistant PA (polyamide) construction for longevity
• Molded mounting bosses and inlet/outlet ports to match OE geometry
• Included pressure cap designed for specified cooling-system calibration
• Vibration-tolerant build to reduce risk of cracks or leaks

How does an expansion tank affect engine cooling and performance?

An expansion (antifreeze) reservoir controls coolant overflow and recovery as temperatures change, preventing air pockets and preserving proper coolant volume. A functioning tank helps the system maintain correct operating temperatures and reduces the strain on the radiator and thermostat assembly.

• Stores expanded coolant when engine temperature rises and returns fluid as it cools
• Helps prevent air from entering the cooling loop, aiding heater performance
• Maintains correct pressure to protect hoses and radiator from overpressure
• Reduces the chance of low-coolant-related overheating issues

What warranty and support are provided with this part?

GDUKOP backs this expansion tank with a one-year unlimited-mileage guarantee for peace of mind after installation. Customer support is available for fitment and installation questions, with typical response windows posted by the seller.

• One-year unlimited-mileage warranty against manufacturing defects
• After-sales contact available—expect a response within 48 hours
• Sold as a complete tank assembly with cap to simplify replacement

Who is this for: The GDUKOP 603-054 expansion reservoir is aimed at owners and technicians maintaining GM full-size trucks and SUVs listed above who need a reliable, OEM-style replacement. It suits DIY mechanics replacing a cracked or leaking reservoir, fleet managers keeping older vehicles roadworthy, and repair shops seeking a budget-conscious, durable alternative that matches OE specifications.