What is ford part number E3TB 19E607AA called It is mounted on passenger side firewall next to battery in a 1990 Ford Econoline Van.?

The Ford part number E3TB 19E607AA refers to the heater control valve. This component is typically mounted on the passenger side firewall near the battery in a 1990 Ford Econoline Van, and it regulates the flow of coolant to the heater core, allowing for the control of cabin heating. If it malfunctions, it can lead to issues with the vehicle's heating system.