Functional description

There is a direct connection between the fuel consumption and the carbon dioxide emissions (CO2). The less fuel consumption, the less carbon dioxide emissions. For particularly efficient engines the coolant expansion tank can be shut off.

The coolant shutoff valve is a solenoid valve. The engine control activates the coolant shutoff valve via a pulse-width modulated signal. The coolant shutoff valve closes upon activation.

Fig 1: Identifying Coolant Shutoff Valve And Plug Connection

Courtesy of BMW OF NORTH AMERICA, INC.