Parts for your 2022 Nissan X-trail-Radiator cap

2022 Nissan X‑Trail radiator cap: where it is, what it does, and when to replace it

Based on Nissan factory technical information for the X‑Trail (T32, Cooling System “CO” section) and the later T33 generation (sold locally from late 2022), plus Nissan’s electronic parts catalogue, the 2022 X‑Trail does not have a cap on the radiator neck. Instead, it uses a pressurised cap on the coolant reservoir (degas) bottle. So when people say “radiator cap” for this model, they’re talking about the reservoir’s pressure cap, which is absolutely relevant to the 2022 X‑Trail’s cooling system.

That cap is a small part with a big job. It seals the system and holds the correct pressure so coolant can run hotter without boiling, keeping the X‑Trail stable on long climbs, hot days, and heavy towing. Inside the cap are valves: one releases excess pressure safely to the overflow path, and another draws coolant back as the engine cools, preventing air pockets. Because the radiator itself has no filler neck on this model, the reservoir cap is the only pressure control point and the main service access for topping up and bleeding air.

Good practice during servicing is to inspect the cap every service and replace it at sensible intervals or if it fails testing. A tired cap can cause annoying and costly symptoms:

• Coolant loss with no obvious external leak
• Overheating under load or at highway speeds
• Collapsed upper hose after cool-down
• Discoloured, cracked, or hardened cap seals

Workshop tips for the 2022 X‑Trail:

• Only open the cap when the engine is cold, pressure and hot coolant can cause injury.
• Use a cooling-system pressure tester with the correct adapter to confirm the cap holds the specified pressure and that the vacuum valve operates smoothly.
• Replace the cap if there’s any doubt. Use a genuine or high-quality cap with the Nissan-specified pressure rating for the vehicle’s VIN.
• Wipe the neck on the reservoir so the seal beds properly, fit the cap squarely and tighten fully by hand.
• Top up with the correct Nissan long‑life coolant specified for the X‑Trail in Australia/New Zealand. Don’t mix coolant types, and bleed air per the service manual procedure.

Technical references: Nissan X‑Trail (T32) and Nissan X‑Trail/Rogue (T33) Factory Service Manuals, Cooling System (CO) section, Nissan Electronic Parts Catalogue listings for the reservoir (degas) bottle cap. These sources confirm the pressure cap lives on the reservoir and the radiator itself has no cap on 2022 models.

Popular questions about the 2022 Nissan X‑Trail radiator cap

Where is the radiator cap on a 2022 X‑Trail?
It’s on the pressurised coolant reservoir in the engine bay, not on the radiator. This design makes filling and air‑bleeding easier and keeps the radiator sealed.

What pressure cap should be used?
Use the cap rating specified for your VIN in the Nissan parts catalogue or service data. Many X‑Trails use a cap around the 0.9–1.1 bar range, but always match the exact spec for your vehicle.

Can a faulty cap cause overheating?
Yes. If the cap can’t hold pressure, the coolant’s boiling point drops and the system can push fluid out under load, leading to overheating and repeated low‑coolant warnings.