Temperature control dial
Subaru Legacy / Subaru Legacy Owners Manual / Climate control / Manual climate control system (if equipped) / Control panel / Temperature control dial

This dial regulates the temperature of airflow from the air outlets over a range from the blue side (cool) to red side (warm).
See also:
Dimensions
...
Pre-heating or pre-cooling the interior of the
vehicle
Before exiting the vehicle, set the temperature
controls to the desired setting
and operation. After the system starts the
vehicle, the heater or air-conditioning will
activate and heat or coo ...
If steam is coming from the engine compartment
Turn off the engine and get everyone away from the vehicle until it cools down. ...
