Description

This is a coolant system pressure cap that fits on the radiator or coolant reservoir neck. It seals the cooling system and maintains proper pressure so coolant does not boil, helping your engine run at a stable temperature. The cap contains a spring‑loaded valve that:

• Releases excess pressure into the overflow tank when hot

• Allows coolant to be drawn back into the system as the engine cools
  ✅ Keeps cooling system pressurized
  ✅ Prevents leaks and boiling
  ✅ Supports consistent engine temperature
  ✅ Protects radiator, hoses, and water pump

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🚗 Common Applications / Fitment

This cap is used on many Nissan & Infiniti vehicles (depending on model/market), generally for models equipped with that radiator neck/coolant system design. Specific fitment depends on year and region.

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🛠 Why It’s Important

If this cap fails, you may notice:
🔹 Overheating
🔹 Coolant leaks
🔹 Loss of cabin heat
🔹 Collapsed hoses after shutdown
🔹 Steam or boiling sounds from under the hood