A-Premium Radiator Coolant Expansion Reservoir Tank with 15 PSI Cap — Direct-Fit for GM Trucks & SUVs, OE-Style Mounting

The A-Premium Radiator Coolant Expansion Overflow Reservoir Tank is a direct-fit replacement coolant recovery tank with a 15 PSI spring-loaded cap designed to restore proper coolant circulation and prevent leaks in compatible GM trucks and SUVs.

This replacement expansion tank from A-Premium is built to match original equipment fit and function for a wide range of Chevrolet, GMC, Cadillac, and Yukon models. Molded from durable automotive-grade plastic and supplied with a spring-loaded twist cap, this pressurized reservoir manages coolant overflow, helps maintain system pressure, and provides a clear, serviceable location for visual level checks. It includes two factory-style mounting points for secure installation and arrives complete with the cap installed.

Which vehicles will this reservoir tank fit?

This A-Premium overflow tank is engineered for specific GM platforms and model years where the original design uses a pressurized coolant recovery bottle. Confirm fit by selecting your Year/Make/Model before ordering.

• Cadillac Escalade / Escalade ESV: 2015–2020, 6.2L
• Chevrolet Silverado 1500/1500 LD, Suburban, Tahoe: select 2014–2020 V6/V8 engines listed in product notes
• GMC Sierra 1500, Sierra 1500 Limited, Yukon, Yukon XL: compatible model years and engines per product reference numbers

How does this tank restore cooling system performance?

Replacing a cracked or leaking expansion tank restores the sealed cooling circuit, allowing the system to reach and hold proper pressure. The included 15 PSI cap maintains operating pressure and returns expelled coolant to the radiator as the engine cools, helping reduce air pockets and coolant loss.

• Pressurized design rated to 15 PSI to match OE requirements
• Spring-loaded twist cap for reliable seal and venting
• Provides a visible coolant level for quick inspections

What are the materials, mounting, and included parts?

This reservoir is constructed from durable plastic formulated for under-hood temperature resistance and corrosion resistance from coolant additives. It ships with the cap installed and uses two OEM-style mounting holes for secure attachment to the vehicle frame or radiator support.

• Material: automotive-grade plastic engineered for coolant exposure
• Mounting: 2 factory-style mounting holes for direct replacement
• Package: 1x reservoir tank and 1x 15 PSI spring-loaded cap

Is installation difficult and what should I check during fitment?

Installation is typically straightforward for a technician or a DIYer with basic tools: drain enough coolant to prevent spillage, remove the old tank and hoses, bolt the new tank in place, reconnect hoses, and refill/bleed the system. Verify hose diameters, mounting locations, and reference numbers before purchase to ensure exact compatibility.

• Recommended: drain coolant to below tank level before removal
• Check part reference numbers: 603-973, 671-00359, 22856231, 3014134
• Bleed the cooling system after installation to remove trapped air

Who is this for: Drivers and technicians who need a reliable, OEM-style replacement coolant expansion tank for compatible Chevrolet, GMC, Cadillac, and Yukon models. Choose this A-Premium reservoir if you want a direct-fit, pressurized tank supplied with a 15 PSI cap, backed by a one-year unlimited-mileage guarantee to restore proper coolant containment, prevent leaks, and keep the cooling system functioning as intended.