Sonata GL V6-2.5L (1999)
Air Door Actuator / Motor: Testing and Inspection
The electronic blend door actuator is located in the side of the evaporator case assembly on the driver's side. The actuator control the position of the
temperature blend door based on a low current signal from the FATC module. Internally an electronic circuit accepts the signal and positions the blend
door with a small DC motor. Also included is a blend door position potentiometer which provide feedback to the FATC module. The blend door actuator
operates based on input information of the temperature setting lever setting signal. The in-vehicle, ambient, engine temperature sensor signal. And this
A/C control module actuates the DC motor according to these signals, also controls the motor operation to adjust the air mix/blend door opening.
CHECKING
1. Connect voltmeter to pin 1 (+) and pin 6 (-).
2. Inspect that voltage changes up to air mixing door position pushing temperature S/W up and down. (COOL: 17°C, HOT: 32°C)
NOTE: Cool means that the mix door is open to cool side. Of course, warm is opposite.
