This Radiator Surge Tank (Coolant Expansion Reservoir) is designed for Isuzu NPR, Isuzu NQR, and Isuzu NRR trucks manufactured from 2011 onward.

The surge tank plays a critical role in the cooling system by:

• Allowing coolant expansion as engine temperature rises

• Maintaining proper system pressure

• Providing a reservoir for excess coolant

• Preventing air from entering the cooling circuit

Over time, surge tanks can crack, discolor, or develop leaks due to heat cycling and pressure fluctuations. A damaged reservoir may cause:

• Coolant loss

• Overheating

• Low coolant warning lights

• Visible cracks or leaks

• Cooling system pressure issues

Replacing a worn surge tank restores proper coolant management and protects the engine from overheating damage. This unit is manufactured to OEM specifications for correct mounting points, hose connections, and capacity.

Key Features

• OEM-style radiator surge tank

• Fits Isuzu NPR, NQR, and NRR (2011-up)

• Durable heat-resistant plastic construction

• Direct-fit hose and mounting alignment

• Maintains proper cooling system pressure

• Prevents coolant overflow and air intrusion

Vehicle Compatibility (2011–Up)

Fits Isuzu Medium-Duty Trucks:

• Isuzu NPR

• Isuzu NQR

• Isuzu NRR

Condition: New OEM replacement
Position: Radiator surge tank / coolant expansion reservoir

Common Signs You Need a New Surge Tank

• Visible cracks in reservoir

• Coolant leaking from tank

• Overheating issues

• Coolant level dropping unexpectedly

• Discolored or brittle plastic

  Frequently Asked Questions (FAQ)

  What does a surge tank do?

  The surge tank allows coolant to expand and contract with temperature changes while maintaining proper system pressure and preventing air entry.

  Which trucks does this fit?

  This surge tank fits Isuzu NPR, NQR, and NRR trucks manufactured from 2011 onward.

  Is this an OEM replacement?

  Yes, this is a new OEM-style radiator surge tank manufactured to factory specifications.

  Do I need to replace the radiator cap as well?

  It is recommended to inspect the radiator cap during replacement to ensure proper pressure regulation.