from the manual---one vacuum door for floor and another for defrost.. maybe one door is stuck, or the controller **** is bad... again, does it switch on and off when you push throttle?

OFF



When OFF is selected:

l The A/C inlet duct door is at full vacuum, closing off outside air and admitting only recirculated air.

l The panel/defrost door is in the no vacuum position, closing the passage to the instrument panel A/C registers.

l The floor/panel door is at full vacuum, closing the passages to the panel/defrost outlets.

l The blower motor and the A/C compressor are off.


PANEL/FLOOR



When PANEL/FLOOR is selected:

l The air inlet duct door is at no vacuum, blocking the recirculated air passage and admitting outside air.

l The panel/defrost door is at full vacuum, closing off airflow to the windshield defroster hose nozzle.

l The floor/panel door is in the partial vacuum position, allowing airflow to both the heater outlet floor duct and the instrument panel A/C registers. There is also some airflow to the A/C side window demisters.

l The A/C compressor will be enabled when PANEL/FLOOR is selected.

l The blower motor is on.


FLOOR



When FLOOR is selected:

l The air inlet duct door is in the no vacuum position, blocking recirculated air and admitting outside air.

l The floor/panel door is in the full vacuum position, directing all airflow to the heater outlet floor duct.

l The temperature can be adjusted to mix airflowing through and around the heater core to achieve the desired temperature level.

l The panel/defrost door is in the no vacuum position, blocking air circulation to the instrument panel A/C registers.

l The A/C compressor will be disabled when FLOOR is selected.

l The blower motor is on.


FLOOR/DEFROST



When FLOOR/DEFROST is selected:

l The air inlet duct door is in the no vacuum position blocking recirculated air and admitting outside air.

l The panel/defrost door is in the no vacuum position directing airflow to the windshield defroster hose nozzle.

l The floor/panel door is in the partial vacuum position, allowing airflow to both the windshield defroster hose nozzle and the heater outlet floor duct. There is also some airflow to the A/C side window demisters.

l The A/C compressor will be enabled when FLOOR/DEFROST is selected to dehumidify the air and reduce windshield fogging.

l The blower motor is on.


DEFROST



When DEFROST is selected:

l The air inlet door is in the no vacuum position, admitting outside air.

l Both the panel/defrost door and the floor/panel door are in the no vacuum position so that most of the incoming air is directed to the windshield defroster hose nozzle. There is also airflow to the A/C side window demisters.

l The temperature setting will determine the amount of air that is directed through the heater core and the amount that bypasses the heater core.

l The A/C compressor will be enabled when DEFROST is selected to dehumidify the air and reduce windshield fogging.

l The blower motor is on.


Manual A/C Electrical Components