When MAX A/C is selected:
- The air inlet door vacuum control motor is at full vacuum, closing off outside air and admitting only recirculated air.
- The panel door vacuum control motor is at full vacuum and the defrost door and floor door vacuum control motors are at no vacuum, directing airflow to the instrument panel A/C registers. A small amount of airflow from the floor duct, defroster duct and side window demisters will be present.
- The heater control valve is at full vacuum when the temperature selection is in the full COOL position, preventing the flow of hot coolant to the heater core. Otherwise, blended air temperature is available.
|1||18A318||Vacuum control motor - panel door|
|3||18A318||Vacuum control motor - defrost door|
|4||-||Panel door (full vacuum position)|
|5||-||Defrost door (full vacuum position)|
|7||-||Side window demister airflow|
|8||-||Temperature blend door (full heat position)|
|9||19860||Evaporator core (part of 19850)|
|10||-||Air inlet door (full vacuum position)|
|11||-||Outside air inlet|
|12||18A318||Vacuum control motor - air inlet door|
|13||-||Recirculated air inlet|
|15||18495||Heater control valve (full vacuum position)|
|17||-||A/C vacuum check valve|
|19||19B888||Function selector switch|
|20||-||Heater control valve vacuum switch|
|22||-||Floor door (full vacuum position)|
|24||18A318||Vacuum control motor - floor door|
Download : Vacuum Diagram 2003 Ford Explorer