TRQ Radiator Coolant Reservoir Overflow Bottle for Chevy/GMC 6.6L V8 (2020–2025) — Preassembled with 20 PSI Cap

This TRQ radiator coolant reservoir overflow bottle is a factory-style replacement designed for Chevrolet Silverado 2500/3500 HD and GMC Sierra 2500/3500 HD models equipped with the 6.6L V8 gasoline engine from 2020 through 2025. Molded from durable plastic and shipped with a matching pressurized cap, the unit restores coolant containment and system pressure without the need for alterations. It arrives preassembled so you can swap the old tank for a new one quickly and get your truck back on the road.

Will this reservoir fit my Silverado or Sierra?

Yes — this tank is built to match the OEM dimensions and mounting points for 2020–2025 Chevrolet Silverado 2500/3500 HD and GMC Sierra 2500/3500 HD with the V8 6.6L gasoline engine. Always verify fitment by cross-referencing your vehicle year, model and engine before purchase.

• Compatible models: Chevy Silverado 2500/3500 HD and GMC Sierra 2500/3500 HD (2020–2025)
• Engine: V8 6.6L gasoline only
• Reference numbers: GM3014192, 84630072, 84630072PFM, 671-10174
• Confirm fit with your vehicle VIN or fitment tool on the retailer page

What comes in the box and what do I need to install it?

The reservoir ships with the 20 PSI pressure cap already installed, and the plastic tank is pressurized like the original. It does not include a level sensor or mounting hardware, so you may reuse existing fasteners and the sensor from your original tank if required.

• Included: pre-assembled plastic reservoir with 20 PSI cap
• Not included: level sensor, mounting bolts, or brackets
• Installation: typically a bolt-on replacement using OEM mounting points
• Handy resource: TRQ DIY videos to guide removal and installation

How durable and reliable is the TRQ replacement reservoir?

Manufactured from resilient plastic and designed for direct-fit replacement, the tank is engineered to withstand normal under-hood conditions and maintain system pressure when paired with the supplied 20 PSI cap. It’s intended as a like-for-like service part for vehicles that need a worn or damaged overflow bottle replaced.

• Material: durable automotive-grade plastic
• Cap pressure rating: 20 PSI to match system requirements
• Pressurized: yes, supplied ready to maintain coolant pressure
• OEM compatibility: direct-fit design reduces the need for modifications

How can I make installation easier and ensure correct fit?

Use TRQ’s online DIY videos and the vehicle compatibility chart to confirm fit and follow step-by-step instructions. Reusing original mounting hardware and sensors when applicable speeds installation and avoids extra purchases.

• Watch TRQ’s step-by-step replacement videos before beginning
• Compare reference numbers (GM3014192, 84630072, 671-10174) to your old part
• Keep original level sensor and hardware if still functional
• Test for leaks and correct coolant level after installation

Who is this for: This TRQ radiator coolant reservoir is aimed at owners and DIY mechanics of 2020–2025 Chevrolet Silverado and GMC Sierra 2500/3500 HD trucks with the 6.6L V8 gasoline engine who need a reliable, direct-fit replacement tank. It’s also useful for shops and technicians looking for an affordable OEM-style service part backed by TRQ’s fitment resources and video guidance.