Eighty-Eight Royale FWD V6-3.8L SC VIN 1 (1995)
Air Door Actuator / Motor: Description and Operation
Circuit Operation
Automatic Climate Controls
DESCRIPTION
Temperature control is accomplished in two ways: by running or not running the A/C compressor and by directing system air either through or around
the heater core.
OPERATION
In this Dual Zone system the air mix door is split in half and each half has its own actuator.
When the system is operating in dual zone mode, the Heating Ventilation and Air Conditioning (HVAC) programmer operates each actuator
separately. Driver side discharge temperature depends on coolant temperature, ambient temperature, in-vehicle temperature, LH solar sensor and
heater and A/C control "SET" temperature information. Passenger side discharge air temperature depends on coolant temperature, ambient
temperature, in-vehicle temperature, RH solar sensor and passenger temperature control setting information.
When the system is operating in any mode but dual zone mode, the actuators are operating in unison as the system works to maintain the Heater and
A/C Control "SET" temperature.
Manual Climate Controls
DESCRIPTION
Temperature control is accomplished moving the temperature valve inside the heater and A/C module assembly to direct air through or around the
heater core. When all air is forced through the heater core, maximum heating is obtained. When all air is routed around the heater core, no heating is
obtained.
OPERATION
The temperature valve is operated by the A/C temperature valve actuator, which mounts on the heater and A/C module assembly. The actuator
contains a reversible DC motor, which responds to a voltage signal from the temperature knob or lever in the heater and A/C control.
With the ignition switch in RUN, battery voltage is present at the heater and A/C control temperature knob or lever.
When the temperature control is moved fully to the left (COOL), less than 1 volt is applied to the A/C temperature valve actuator, the actuator
operates the temperature valve to completely block air flow through the heater core, and no heating is obtained.
When the control is moved fully to the right (WARM), battery voltage is applied to the A/C temperature valve actuator, the actuator operates the
temperature valve to direct all air through the heater core, and maximum heating is obtained.
