Parts for your 2022 Volkswagen Amarok-Radiator cap

2022 Volkswagen Amarok radiator-cap

For the 2022 Volkswagen Amarok, a traditional radiator-cap on the radiator itself is not used. Volkswagen’s own technical literature makes this clear: the Amarok Owner’s Manual (AU/NZ, Cooling System section) and the Volkswagen ErWin Workshop Manual for Amarok (Engine Cooling – Design and Function, Coolant Circulation Overview) describe a sealed, pressurised cooling system that’s filled and vented via a remote coolant expansion (degassing) tank. Parts catalogues for the Amarok show the radiator without a filler neck, and a separate expansion tank with a pressure cap. That cap is the system’s pressure relief and sealing point—so while people often say “radiator cap”, on this model the functional cap lives on the expansion tank under the bonnet.

Why doesn’t the 2022 Amarok use a radiator-cap? Modern VW cooling systems are designed around a high-mounted expansion/degassing tank to keep the system sealed, improve aeration control, and make bleeding easier. With aluminium/plastic radiators and tight front-end packaging, deleting a filler neck on the radiator reduces leak points and improves durability. The pressure cap on the expansion tank regulates system pressure and provides overpressure/underpressure protection, just as an old-school radiator cap would—only it’s relocated for better serviceability and cooling performance.

What owners should service instead is the coolant expansion tank cap. Only open it when the engine is completely cold. Inspect the rubber seal for hardening, cracks, or flattening, check the cap body for warping, and make sure the spring holds pressure smoothly. If there’s unexplained coolant loss, a sweet coolant smell, hose collapse after cool-down, or the system pushes coolant into the overflow, have the cap pressure-tested and replace it if it can’t hold the specified pressure (the rating is printed on the cap, typically around 1.2–1.5 bar for VW light commercials—follow what’s on the vehicle and in the manual).

• Use only VW-approved coolant as specified in the Owner’s Manual, mixed correctly with demineralised water.
• Top up to the MIN–MAX marks on the translucent tank, never overfill.
• Refit the cap hand-tight until it seats firmly—don’t force it.
• After any cooling system work, run the engine to operating temperature with the heater on to purge air and recheck the level once cool.

Technical sources referenced: Volkswagen Amarok Owner’s Manual (MY2022, Cooling System/Coolant), Volkswagen ErWin Workshop Manual – Amarok (Engine Cooling – Design and Function, Coolant Circuit Overview), Volkswagen Group parts catalogue entries for Amarok (radiator without filler neck, separate coolant expansion tank with pressure cap).

Popular questions about the 2022 Volkswagen Amarok radiator-cap

Does the 2022 Volkswagen Amarok have a radiator cap?
The 2022 Amarok doesn’t use a cap on the radiator. It uses a sealed coolant expansion tank with a pressure cap that does the same job—regulating pressure and allowing safe venting. That’s the cap to check, service, or replace.

Where is the coolant cap on a 2022 Amarok and how should it be opened?
It’s the screw cap on the translucent coolant expansion tank under the bonnet. Only open it when the engine is stone cold. Turn it slowly to the first detent to release any residual pressure, then remove. Top up with VW-approved coolant to the MIN–MAX marks and refit the cap firmly.

When should the Amarok’s coolant cap be replaced?
Replace it if the seal is perished, the cap is cracked or warped, or a pressure test shows it won’t hold the marked rating. Symptoms can include recurring coolant loss, overflowing after shut-down, or hoses collapsing when the engine cools. Many workshops test or replace the cap during cooling system service as cheap insurance.