DMS Engine Bay Coolant Expansion Tank – 2016-2019 Cadillac CTS-V (V3)

Upgrade your cooling system with the DMS Engine Bay Tank—designed specifically for the 2016–2019 Cadillac CTS-V (V3). Whether you’re pushing your LT4-powered V3 hard on the track or just want to enhance long-term reliability, this high-capacity coolant expansion tank is the answer.

Why It Matters:

• Adds Nearly 1 Gallon of Coolant Capacity – Helps lower intake air temps (IATs) and enhances thermal stability during spirited driving.
• Improves System Efficiency – Extra volume allows trapped air to purge more effectively, resulting in smoother operation and better intercooler performance.
• Simplifies Maintenance – The integrated 1.5" billet filler neck and cap make bleeding and refilling the system quick and easy.

Key Features:

• .125" Thick Aluminum Construction – Strong, lightweight, and built to last.
• TIG Welded In-House – Precision craftsmanship for performance-focused builds.
• Satin Black Powder Coated Finish – Clean OEM+ look with added corrosion resistance.
• 3/4” Inlet/Outlet Barbs – Ensures smooth, high-flow coolant routing.
• Includes All Hardware –  Clamps, and fasteners included for a true bolt-in solution.
• 3ft of 5/8 Heater Hose
• 30-Minute Install Time – Simple installation with no cutting or custom fabrication required.

Vehicle Fitment:

• 2016, 2017, 2018, 2019 Cadillac CTS-V (Gen 3 / V3)

Whether you're chasing ETs or just want more consistent cooling performance, the DMS Engine Bay Tank is the ultimate upgrade for any V3 CTS-V owner serious about performance and reliability.

See install instructions here