YEHERIT 603-973 Coolant Expansion Reservoir Tank with Cap — Replaces OE 22856231 (Chevy/GMC/Cadillac)

Overview

The YEHERIT 603-973 coolant expansion reservoir tank with cap is a purpose-built replacement designed to fit a broad range of GM vehicles. It’s built to endure the demands of daily driving, helping you maintain a consistent cooling loop under various temperatures and road conditions.

Constructed from durable PA plastic, this tank is engineered to withstand heat and engine vibrations. The replacement OE numbers (603-973, 22856231, 671-00359, 603973, 3014134, 67100359) help you confirm compatibility quickly and ensure you’re selecting a trusted cross-reference.

What it does

In a vehicle’s cooling system, the expansion reservoir stores coolant that escapes from the radiator during engine heat. As the engine cools, coolant returns to the radiator to maintain proper pressure and flow. This cycle helps support stable temperature behavior and helps keep the cooling system primed for operation.

Key benefits

• Durable PA plastic construction resists heat and vibration for long-lasting service life
• Effective coolant storage and pressure management within the cooling loop
• Designed to complement heating system efficiency and overall engine performance
• Replaces multiple OE references for easier cross-compatibility across GM models
• Cap included for a secure seal and reliable operation

Fitment and use

The reservoir is compatible with a wide array of GM vehicles, including Cadillac Escalade and Escalade ESV (2015–2020, 6.2L), Chevrolet Silverado 1500 (2014–2019, 4.3L/5.3L) and Silverado 1500 LD (2019, 5.3L), Suburban (2015–2020, 5.3L/6.0L/6.2L) and Tahoe (2015–2020, 5.3L/6.2L), GMC Sierra 1500 (2015–2019, 4.3L/5.3L/6.2L), Sierra 1500 Limited (2019, 5.3L), Yukon (2015–2020, 5.3L/6.2L), and Yukon XL (2015–2019, 5.3L/6.2L). Matching OE numbers help confirm the correct cross-reference for your model.

Quality and warranty

YEHERIT backs this expansion tank with a one-year unlimited-mileage guarantee and responsive after-sales support. If you have questions, the team aims to respond within 48 hours to help with fitment or installation concerns.

How to think about installation

While many DIY enthusiasts can replace coolant reservoirs, consider professional service if you’re working around the cooling system’s hoses and pressure. Proper resealing and a clear cooling system inspection are recommended after replacement.