2013 SSANGYONG KORANDO Service Manual

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(4) Air source control
When pressing the air source selection switch, the air source mode is changed via the intake actuator's
operation. The air source mode is switched between the fresh air and recirculation alternatively each
time the switch is pressed. You can see the air source mode through the switch's indicator. (the indicator
comes on at recirculation mode)
Control by vehicle speed
The air source selection is controlled in accordance with the vehicle speed while driving. Operating
conditions and control process are as follows:
When the PTC heater operates at fresh air mode in winter
When the vehicle speed is 45 km/h or lower in fresh air mode, the air source door is open 30% of its
maximum opening. If the vehicle speed is 65 km/h or more, then the air source door is completely
open. -
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However, the electronic fan should be more than 7.5 V.
Air source selection switch

(5) Air distribution control
The driver can select one of 5 air distribution modes using the 5 air distribution switches in the center of
the MTC The selected air distribution mode is changed by the mode actuator and acknowledged by the
indicator for each switch coming on
Vent mode
If the vent mode switch is pressed, the indicator comes on while the air flows to the
upper part of the body.
Bi-level mode
Foot mode
If the bi-level mode switch is pressed, the indicator comes on while the air flows to
the footwell and upper part of the body.
If the foot mode switch is pressed, the indicator comes on while the air flows to the
footwell.
Defroster mode switch
Bi-level mode switch Foot mode switchVent mode switch
Defroster & foot mode switch

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Defroster & foot mode
If the defroster & foot mode switch is pressed, the indicator comes on while the air
flows to the footwell and the windshield.
Defroster mode
This is used to remove the condensation from the windshield. When you press the
switch, the indicator comes on and the air distribution is changed to the windshield
at the same time, then the air conditioner starts to operate.

(6) A/C control
The air conditioner is operated at the defroster mode and MAX air conditioner mode and when the A/C
switch is turned to "ON" position. It is controlled by the A/C compressor of the engine ECU according to
the signal from the heater and A/C control assembly. The driver can see that the A/C has been activated
when an indicator lamps at the A/C switch and MAX A/C switch comes on. If the intake sensor detects
the freezing of the evaporator core, it stops the air conditioner by turning off the compressor.
MAX A/C control
This is designed for increasing driver comfort. When the switch is pressed, the air conditioner is
operated and vent and recirculation modes are selected automatically. The discharge temperature and
fan speed are regulated depending on the driver's choice.
A/C switch
MAX A/C control switch

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5. PTC HEATER OPERATION PROCESS
1) PTC Heater Input/Output Factors
The engine ECU controls the PTC (Positive Temperature Coefficient) heater system by adjusting the
power supplied to the PTC system according to the two measured temperature values from the engine
coolant temperature sensor and HFM sensor. This system is mounted to the heater air outlet in the air
condition system module and heats the air which flows to the passenger room. Since the PTC system is
heated by the electrical power, the electric load and alternator capacity is greater than the conventional
one. The PTC is not operated when a) the engine is cranking, b) the battery voltage is below 11 V, c) the
glow plug is being preheated.
The ceramic PTC features that the resistance rises quickly in a certain temperature range. The PTC
heater has 3 circuits with power of 330 W. While only 1 circuit in the PTC heater is connected during
PTC1 operation, 2 circuits are connected during PTC2 or PTC3 operation.

2) Control Condition For PTC Heater
Operation Operating condition PTC heater status
HI mode operation
(PTC2, 3)PTC heater operates in
"HIGH" mode if operating
conditions are met
LO mode operation
(PTC1)PTC heater operates in
"LOW" mode if operating
conditions are met
Conditions for
deactivating
Air conditioner blower switch OFF
When the ambient temperature sensor is
faulty (short or open circuit in the wiring)
Engine is cranking
Battery voltage is 11 V or less
Glow plug is being preheated (Glow indicator
comes on) -
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Conditions for PTC heater "LOW" operation mode (2nd step)

6. CIRCUIT DIAGRAM