G
Gliderbee California 6.1
The air inlet for the Parking Heater is on the Drivers step,RHD, [ passenger step LHD]. The inlet temperature sensor is in the air inlet to the heater unit.
The heater controls control the air inlet temperature and will keep the heater operating until the air inlet temperature matches the Temperature Level set on the Control panel.
On a cold day with drivers window open, as cold air is denser, the air inlet temperature drops as it draws in more cold air from the open window so the Parking Heater stays on full power for longer until the air inlet temperature , composed of cabin air and cold air from the open window, matches the Control panel temperature level and then the heater gradually backs off to a maintenance level or goes into standby with a low fan speed. Once the inlet air temperature drops the heater output increases.
Thanks ! That makes it clear .