Aluminum Coolant Overflow Expansion Tank for Infiniti Q60 (2017-2021) 3.0L

TIG-Welded Aluminum Coolant Overflow Expansion Tank for 2017-2021 Infiniti Q60 (CV37)

What it Does: The Aluminum Coolant Overflow Expansion Tank replaces the leak-prone dual-chamber factory plastic reservoir on the 2017-2021 Infiniti Q60 to eliminate seam failure and maintain constant cooling system operating pressure.

The Stock Infiniti Q60 Plastic Reservoir Failure Point

From the factory, the CV37 Q60 relies on a molded dual-chamber plastic tank to manage thermal expansion across two independent circuits: the engine block cooling system and the water-to-air charge-air cooler circuit. In the twin-turbocharged VR30DDTT engine bay, radiant exhaust manifold heat and extreme thermal cycling degrade the stock polymer. Over time, plastic fatigue leads to micro-fracturing along the molded ultrasonic center seam, neck deformation, and pressure loss. When tuned cars run increased boost, elevated engine bay heat accelerates embrittlement, often causing catastrophic coolant venting and pressurized fluid loss mid-drive.

The Engineering Solution

Constructed from heavy-duty AA5052 aluminum, this direct-replacement expansion tank eliminates brittle plastic failure points. The unit features 100% precision TIG-welded seams engineered to withstand elevated cooling system pressure without fatigue, ballooning, or stress-cracking. It maintains the factory dual-chamber internal isolation, preserving separate fluid circuits for the twin-turbo charge coolers and the primary radiator. Complete with vehicle-matched inlet and outlet barbs, factory-spec mounting tabs, and replacement pressurized caps, this tank bolts directly to the OEM chassis location with zero line modification.

Technical Specifications

Compatibility

• 2017 - 2021 Infiniti Q60 3.0t Luxe (3.0L Twin Turbo VR30DDTT)
• 2017 - 2021 Infiniti Q60 3.0t Sport (3.0L Twin Turbo VR30DDTT)
• 2017 - 2018 Infiniti Q60 3.0t Premium (3.0L Twin Turbo VR30DDTT)
• 2017 - 2021 Infiniti Q60 Red Sport 400 (3.0L Twin Turbo VR30DDTT)
• Note: Does not fit 2.0L Turbo 4-cylinder Q60 models.

Frequently Asked Questions

Does this fit the CV37 Q60?

Yes, this is a direct fit for the 2017-2021 Infiniti Q60 equipped with the VR30DDTT engine.

Do I need to bleed both cooling systems after installation?

Yes, because the VR30 platform utilizes separate engine and intercooler circuits, both loops must be drained, refilled, and independently bled of air pockets to prevent heat soak and overheating.

The Infiniti Performance Standard

The VR30 platform generates substantial boost and rapid power delivery, demanding bulletproof thermal management hardware that outlasts repetitive heat cycles on the street and track.