YzusGomumu Coolant Reservoir Tank Replacement for Cadillac Chevy GMC Buick — OE-fit Thermoplastic

The YzusGomumu coolant reservoir tank is a direct-fit replacement overflow tank engineered to restore proper coolant level control and pressure management for select Cadillac, Chevrolet, GMC, and Buick models.

This replacement coolant radiator reservoir is manufactured to match OE fit and function so you can replace a cracked, leaking, or discolored tank quickly and get the cooling system back to normal operation. Built from durable thermoplastic and designed to tolerate repeated temperature swings and system pressure changes, the tank includes the correct mounting points and inlet/outlet locations for straightforward installation. Before ordering, confirm compatibility with your vehicle's model year and engine code to ensure the correct part number.

Which vehicles does this reservoir tank work with?

The YzusGomumu tank fits a broad range of GM models from recent years, covering multiple engine sizes. Review the compatibility list and OE numbers to confirm you're ordering the correct replacement for your vehicle.

• Cadillac: XT4 (2019–2021) 2.0L; XT5 (2017–2021) 2.0L & 3.6L; XT6 (2021) 2.0L & (2020–2021) 3.6L
• Chevrolet: Blazer (2020–2021) 2.0L/2.5L/3.6L; Equinox (2018–2021) 1.5L/1.6L/2.0L; Malibu (2016–2021) 1.5L/2.0L
• GMC: Acadia (2017–2021) 2.0L/2.5L/3.6L; Terrain (2018–2021) 1.5L/1.6L/2.0L
• Buick: LaCrosse (2017–2019) 3.6L; Regal/Regal Sportback/TourX (2018–2020) 2.0L & 3.6L; Envision (2021) 2.0L
• OE reference numbers: 23386455 and 603-861 — verify against your vehicle's part number before purchase

How does this tank help my cooling system perform better?

The reservoir stores and supplies coolant to the radiator while providing room for thermal expansion. Replacing a failing tank prevents leaks and loss of coolant, reducing the chance of overheating-related drivability issues when the rest of the cooling system is functioning properly.

• Maintains correct coolant level between system cycles
• Provides pressure relief and recovery during temperature changes
• Prevents coolant loss caused by cracks, discoloration, or fractured mounts

What materials and features ensure long life for this replacement tank?

This tank is molded from high-strength automotive-grade thermoplastic formulated to resist heat, coolant chemistry, and vibration. Reinforced mounting bosses and properly located hose connections reduce stress points that commonly cause failures in older or OEM-worn components.

• Heat- and pressure-resistant construction for repeated cycles
• Accurate molding for correct hose, cap, and bracket alignment
• Corrosion- and chemical-resistant surface for extended service life

How difficult is installation and what should I check before fitting?

Installation is typically straightforward for a mechanically inclined owner with basic tools, but procedures vary by model. Drain enough coolant to avoid spills, remove the old tank and hoses, transfer any required sensors or fittings, and mount the new reservoir using the factory hardware and torque specs.

• Confirm OE numbers (23386455 / 603-861) match your factory part
• Have coolant and simple hand tools ready; some models require minimal trim
• Bleed the cooling system per manufacturer procedure after installation

Who is this for: This YzusGomumu replacement reservoir tank is aimed at owners and technicians maintaining Cadillac, Chevrolet, GMC, and Buick vehicles listed above who need a reliable, OEM-form fit tank to replace failing or aged overflow reservoirs. It’s a practical purchase for DIY mechanics, repair shops, and fleet maintenance teams looking for a durable, budget-friendly part that restores cooling system integrity.