Vacuum Hose Heater Control Valve

From what i read elsewhere it sounds like that might be what applies the vacuum to turn on the heater control valve.

Vacuum hose heater control valve.

Vacuum operated heater control valve to open and close the flow of water in the heater system. Mechanical cruise control servo. It has an electric plug and 2 small hose barbs on it. It sits between the water pump heater hose and the heater core.

This is the most common valve on aftermarket heat and a c evaporator units that use vacuum operated controls. On older vehicles the valve is operated by a cable while newer vehicles used a vacuum actuator controlled valve. Apdty 140176 hvac heater hose control valve unit fits 2005 2010 infiniti qx56 2004 2015 nissan armada includes 2004 pathfinder armada replaces 92400 zw10a 92400zw10a by apdty 82 60 82. It may be located on the inlet or the outlet port of the heater core and activated by a cable electronic control or a vacuum signal.

The valve uses 5 8 heater hoses and 1 8 vacuum tube. The heater control valve allows the flow of coolant through the heater core to be controlled and switched on and off without affecting the operation of the rest of the cooling system. The valve is opened with vacuum it is normally closed. Air passing through the heater core creates hot air in your vents.

The heater control valve is found in front of the firewall of the vehicle. In some cars the heat is regulated by a heater control valve that controls the flow of hot engine coolant from the engine to the car s heater core. I m guessing that it electrically opens a valve that allows vacuum from the engine to be applied to the heater control valve. The heater control valve opens and closes to allow warm coolant to flow through the heater core.