Kia 2004.5 Spectra Service Technical Training page 231

2004.5 Spectra Technology
AIR DISTRIBUTION BOX
COMPONENTS
DUCT/FIN SENSOR
Heating, Ventilation, & Air Conditioning (HVAC)
The air distribution box houses the following:
• Heater Core with engine coolant flowing through it
• Evaporator Core (if equipped)
• Fin Sensor (Thermostatic Switch)
• Mode Control Actuator
• 3 doors for the following positions
• Defrost
• Floor
• Center
• Mixed
• Door position sensor (Potentiometer)
• Fresh and Recirculation Intake Actuator
• 1 door for the following positions
• Recirculated
• Fresh air
• Temperature Actuator
• 1 door
• Door position sensor (Potentiometer)
The fin sensor is a thermostatic switch (NTC thermistor)
that will detect the evaporator core temperature and
interrupt A/C compressor relay power in order to
prevent evaporator freeze up due to excessive cooling.
The sensor can be inspected by checking the output
voltage at terminal 1. Terminal 2 is 5V reference from
A/C control module. Terminal 3 is not used.
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