Engine Coolant Thermostat Assembly ️

Keep your Nissan/Infiniti powertrain at the right temperature. This OE-spec thermostat regulates coolant flow between the engine and radiator, securing fast warm-up and steady operating heat for efficiency and durability.

How It Works

Inside the housing is a wax pellet that expands at a calibrated temperature. As it heats, it pushes a plunger to open the valve; when coolant cools, a spring closes it. This controlled cycle keeps the engine near its optimal range, supports clean combustion, and ensures strong cabin heat.

Why You Need It

Proper temperature control protects oil film, sensors, and gaskets. A fresh, precise-opening unit restores stable gauge readings, lowers emissions, and prevents heat stress during traffic, towing, or hot weather.

What Happens If It Fails

Stuck closed: rapid overheating, boiling coolant, warped heads, blown head gasket. Stuck open: cold running, high fuel use, weak heater, rich codes. Unstable temps cause poor performance, rough shifting, and shortened engine life. Replace with quality hardware, new seal, fresh coolant, and bleed air for best results .

Compatibility

• M35
• M45