SsangYong Korando III (2010 year). Service manual — part 78
15-34
Coolant temp.
sensor
(8) Cooling fan control
a. Overview of cooling fan and A/C compressor
The cooling system maintains the engine temperature at an efficient level during all engine operating
conditions. The water pump draws the coolant from the radiator. The coolant then circulates through
water jackets in the engine block, the intake manifold, and the cylinder head. When the coolant reaches
the operating temperature of the thermostat, the thermostat opens. The coolant then goes back to the
radiator where it cools. The heat from automatic transaxle is also cooled down through the radiator by
circulating the oil through the oil pump.
There are two cooling fans (200W+150W) in D20DTF engine. ECU controls the electric cooling fans
with three cooling fan relays to improve the engine torque and air conditioning performance.
For details about A/C compressor and refrigerant pressure sensor, refer to Chapter "Air Conditioning
System" in "Body" section.
b. Components
Refrigerant pres.
sensor
A/C compressor
ECU
D20DTF
DSI 6 A/T
(ATF temp.)
Cooling fan module
HFM sensor
(Intake air
temperature)
Engine room
relay box
15-35
0000-00
c. Input/Output for cooling fan and A/C compressor
15-36
d. Cooling fan and A/C compressor control
Conditions for cooling fan
▶
The cooling fan module controls the cooling fan relay, high speed relay and low speed relay. The cooling
fan is controlled by the series and parallel circuits.
A/C switch
Cooling fan
Coolant temperature
Refrigerant pressure
A/C
compressor
OFF
OFF
Coolant temp. < 90℃
-
LO
90℃ ≤ Coolant temp.
< 105℃
-
HI
105℃ ≤ Coolant temp
-
ON
LO
Coolant temp. < 105℃
Refrigerant pressure <
18 bar
ON
HI
18 bar ≤ Refrigerant
pressure
HI
105℃ ≤ Coolant temp.
< 115℃
-
HI
115℃ ≤ Coolant temp.
- OFF
(cut)
A/C compressor OFF conditions
▶
Coolant temperature: below -20℃ or over
115℃
Approx. 4 seconds after starting the engine
Engine rpm: below 650 rpm or over 4500 rpm
When abrupt acceleration
Refrigerant pressure:
* OFF below 2.0 kg/㎠, then ON over 2.4 kg/㎠
* OFF over 30 kg/㎠, then ON below 21.4 kg/㎠
-
-
-
-
-
The output voltage from refrigerant pressure sensor is 1.7 V to 3.5 V when the refrigerant pressure is 10
to 24 kgf/㎠ with A/C "ON".
Output voltage according to refrigerant pressure
▶
Cooling fan control according to ATF temperature
▶
ATF temperature
Cooling fan
Remark
Over 100˚C
High speed
-
15-37
0000-00
HFM
(Intake air temp.)
Coolant temp.
sensor
(9) PTC heater control
a. Overview
The supplementary electrical heater is installed in DI engine equipped vehicle as a basic equipment. The
PTC system is operated according to two temperature values measured at the coolant temperature
sensor and HFM sensor. This device is mounted in the heater air outlet and increase the temperature of
air to the passenger compartment. Because PTC system is heated by electrical power, high capacity
alternator is required. PTC does not operate during engine cranking, while the battery voltage is lower
than 11 V or during preheating process of glow plugs.
b. Components
PTC heater
D20DTF
ECU
Engine room relay box
A: PTC 1 (changeable)
B: PTC 2,3 (not changeable)
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