System Description

The multi-way control valve changes the paths to radiator, heater, engine oil cooler and ATF warmer according to engine coolant temperature and driving conditions.

When coolant temperature is low, the paths to radiator, heater, engine oil cooler and ATF warmer are closed and coolant is circulated only inside the engine to accelerate engine warm-up.

When coolant temperature is high, the paths to radiator, heater, engine oil cooler and ATF warmer are opened and coolant is refrigerated. This raises the coolant temperature and oil temperature rapidly and improves the fuel economy by reducing friction among parts.

Operation 

When the ignition switch is OFF, the valve is fully opened to accelerate bleeding the coolant channels.

When receiving a blower fan ON signal ECM opens the flow path to the heater even when coolant temperature is low.

Courtesy of NISSAN NORTH AMERICA, INC.

Courtesy of NISSAN NORTH AMERICA, INC.

A: Closes all flow paths , , and and circulates coolant only inside the engine.

B: Opens the flow path to heater and circulates coolant to heater.

C: Opens the flow path to engine oil cooler / ATF warmer and circulates coolant to heater and engine oil cooler & ATF warmer.

D: Opens the flow path to radiator and circulates coolant to heater, engine oil cooler / ATF warmer and radiator.

E: Opens all the flow paths , , and .