Maintain a secure seal on your Patrol’s coolant overflow system with this Genuine Nissan Bottom Overflow Bottle Cap, designed for Nissan Patrol GU Y61 models fitted with ZD30 and TD42Ti engines. This OEM yellow cap screws onto the lower overflow bottle and ensures the cooling system remains properly sealed, helping maintain correct coolant flow between the radiator and overflow reservoir.

Over time, overflow bottle caps can become brittle, cracked, or loose due to heat cycles, engine bay vibration, and general ageing. A damaged or missing cap can allow coolant loss, contamination, or incorrect system pressure balance, which may contribute to overheating issues or inconsistent coolant recovery. Replacing it with a genuine Nissan part ensures correct fitment, reliable sealing, and proper cooling system operation.

Manufactured to Nissan factory specifications, this genuine cap provides durable construction, heat resistance, and long-lasting performance in harsh Australian driving conditions. It is a direct replacement with no modifications required.

Features & Benefits

• Genuine Nissan OEM part for precise fitment and reliable sealing
• Designed specifically for Nissan Patrol GU Y61 ZD30 and TD42Ti engines
• Seals the lower overflow bottle in twin tank coolant systems
• Helps maintain correct coolant transfer between radiator and reservoir
• Durable heat-resistant plastic construction for long service life
• Bright yellow colour for easy identification during maintenance checks
• Direct replacement with no modifications required

Vehicle Fitment

Suitable for:

• Nissan Patrol GU Y61

Please confirm compatibility before purchase or contact us with your VIN for assistance.

Common Signs of a Worn or Failing Overflow Bottle Cap

• Coolant loss from overflow system
• Loose, cracked, or missing cap
• Visible coolant residue around bottle or cap area
• Overflow bottle not retaining coolant correctly
• Cooling system pressure inconsistencies
• Engine running hotter than normal under load

Replacing this small but important component helps maintain proper cooling system balance, prevent coolant loss, and ensure long-term reliability of your Patrol’s engine.