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THERMOSTAT WATER ASSY ZB75MH-76.5 / ME997210 is an engine coolant thermostat assembly used in diesel commercial vehicles, especially Mitsubishi Fuso Canter trucks with 4D-series engines.
It is a wax-type, bottom-bypass thermostat designed to regulate coolant circulation between the engine and radiator. The thermostat begins opening at 76.5 °C, allowing the engine to quickly reach and then maintain its correct operating temperature, even in high-ambient GCC conditions.

This assembly is installed inside the engine thermostat housing and works automatically without electronic control.

⚙️ FUNCTIONS

1. Controls Engine Temperature

   • Remains closed when the engine is cold, restricting coolant flow to help the engine warm up faster.

   • Opens at ~76.5 °C, allowing coolant to flow to the radiator for cooling.

2. Prevents Overheating

   • Regulates coolant flow during high loads, long driving hours, and extreme heat typical in the GCC region.

3. Improves Engine Efficiency

   • Keeps the engine at optimal temperature, improving combustion efficiency and fuel economy.

4. Protects Engine Components

   • Reduces thermal stress on the cylinder head, gaskets, pistons, and cooling system components.

5. Supports Bypass Cooling System

   • The bottom-bypass design ensures controlled internal coolant circulation before full radiator flow begins.

6. Extends Engine Life

   • Stable temperature control minimizes wear, sludge formation, and coolant breakdown.