SsangYong Korando III (2010 year). Manual — part 576
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(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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6810-00
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.
The PTC heater operates as follows: temperature rises above specified level→resistance
increases→current decreases→calorific value decreases→temperature drops→resistance
increases→current increases→temperature rises.
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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)
-
-
-
-
-
Coolant temperature < 15℃
-
Coolant temperature 15℃ ≤ 65℃ and
intake temperature ≤ -10℃
Coolant temperature 15℃ < 65 ~ 60℃ and
intake temperature < -10℃ ~ 0℃
Coolant temperature 15℃ ≤ 65℃ and
intake temperature ≤ 0℃ ~ 5℃
-
-
-
Conditions for PTC heater "LOW" operation mode (2nd step)
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