Terrain Tamer Coolant Overflow Tank LandCruiser HZJ HDJ 75 78 79 Series

Terrain Tamer coolant overflow tank to suit Toyota LandCruiser 75, 78 and 79 Series models.

Maintains correct coolant level by allowing expansion and recovery of coolant during engine operation.

Essential for proper cooling system operation — prevents coolant loss and air entering the system.

This overflow tank is part of the cooling system and manages coolant expansion and recovery.

As the engine heats up, coolant expands and flows into the tank.

When the engine cools, coolant is drawn back into the radiator.

This process:

• Maintains correct coolant levels
• Prevents air entering the system
• Supports stable engine temperatures

Over time, original tanks:

• Crack
• Become brittle
• Leak or fail at hose connections

Replacing the tank restores proper cooling system function and reliability.

Vehicle Compatibility

• Toyota LandCruiser HZJ75
• Toyota LandCruiser HDJ75
• Toyota LandCruiser HZJ78
• Toyota LandCruiser HDJ78
• Toyota LandCruiser HZJ79
• Toyota LandCruiser HDJ79

(70 Series 6-cylinder diesel models)

Common Questions

What does an overflow tank do?

Stores and returns coolant as it expands and contracts.

Will a cracked tank cause overheating?

Yes — loss of coolant and air in the system can lead to overheating.

Is this a common failure?

Yes — plastic tanks become brittle and crack with age.

Is this a direct replacement?

Yes — designed to match factory mounting and hose connections.