Engine Coolant Thermostat Assembly

This thermostat assembly is a key part of the cooling system that helps your Nissan engine reach the right working temperature fast and then keep it stable ️. You need it to prevent slow warm-up, overheating, and poor heater performance. A healthy thermostat also supports good fuel economy and lowers engine wear.

How It Works

Inside the housing is a temperature-sensitive valve. When the coolant is cold, the valve stays closed, forcing coolant to circulate mainly within the engine so it warms up quickly. As temperature rises, the valve opens step-by-step, letting coolant flow to the radiator to shed heat. This balanced flow keeps the temperature gauge steady and protects head gasket, hoses, and radiator.

What Happens If It Fails

Stuck Closed

Coolant can’t reach the radiator, leading to rapid overheating , pressure buildup, and possible engine damage.

Stuck Open

The engine may run too cool ❄️, causing weak cabin heat, higher fuel use, rough running, and faster sludge formation.

Compatible Models

• Murano
• Teana
• Quest
• Presage