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The Thermostat Water Assembly 90916-03100 is an engine coolant thermostat used in Toyota / Lexus vehicles, mainly with UZ-series V8 engines.
It is installed in the engine cooling system and is responsible for controlling coolant flow between the engine and the radiator. The unit typically includes the thermostat valve and sealing gasket, ensuring precise temperature regulation even in hot GCC driving conditions.

This part is designed to meet OEM specifications, making it suitable for high-temperature, desert, and heavy-load operation commonly seen in GCC countries.

⚙️ Functions

• Regulates Engine Temperature
  Keeps the engine at its optimal operating temperature by opening and closing based on coolant heat.

• Cold Start Control
  Remains closed during cold starts, allowing the engine to warm up faster and reduce wear.

• Prevents Overheating
  Opens at the specified temperature to allow coolant flow to the radiator, preventing engine overheating.

• Improves Fuel Efficiency
  Proper temperature control helps maintain correct fuel combustion and engine efficiency.

• Protects Engine Components
  Reduces thermal stress on engine parts such as the cylinder head, gasket, and radiator.

• Supports GCC Climate Operation
  Designed to handle extreme ambient temperatures, long highway driving, and stop-and-go traffic typical in the GCC region.