SsangYong Rexton. Manual — part 632
MANUAL CONTROL HVAC SYSTEM 7C-3
SSANGYONG Y200
Receiver-Drier
The sealed receiver-drier assembly is connected
between the condenser and evaporator. It acts as a
refrigerant storing container, receiving liquid and some
vapor and refrigerant oil from the condenser.
At the bottom of the receiver-drier is the desiccant,
which acts as drying agent for the moisture that may
have entered the system. An oil bleed hole is located
near the bottom of the receiver-drier outlet pipe to
provide an oil return path to the compressor. The
receiver drier is serviceable as an assembly.
Expansion Valve
The expansion valve can fall in three different positions:
open, closed or restricted.
An expansion valve that fails in open position will result
in a noisy A/C compressor or no cooling. The cause
can be a broken spring, a broken ball or excessive
moisture in the A/C system. If the spring or the ball
are found to be defective, replace the expansion valve.
If excessive moisture is found in the A/C system
recycle the refrigerant.
A restricted expansion valve will result in low suction
pressure and no cooling. This may be caused by debris
in the refrigerant system. If debris is believed to be
the cause, recycle the refrigerant, replace the
expansion valve and replace the receiver-drier.
Evaporator
T h e e v a p o r a t o r i s a d e v i c e w h i c h c o o l s a n d
dehumidifies the air before it enters the vehicle. High
pressure liquid refrigerant flows through the expansion
tube (orifice) and becomes a low pressure gas in the
evaporator. The heat in the air passing through the
evaporator core is transferred to the cooler surface or
the core, which cools the air.
As the process of heat transfer from the air the
evaporator core surface is taking place, any moisture
(humidity) in the air condenses on the outside surface
of the evaporator core and is drained off as water.
Pressure Relief Valve
The compressor is equipped with a pressure relies
valve which is placed in the system as a safety factor.
Under certain conditions, the refrigerant on the
discharge side may exceed the designed operating
pressure at approximately at 3,171 to 4,137 kPa
(460 to 600 psi) in an R-134a system. Conditions that
might cause this valve to open, such as a defective
pressure transducer, an inoperative cooling fan, etc.,
should be corrected. The refrigerant oil and the
refrigerant should be replaced as necessary.
Controller
The operation of the A/C system is controlled by the
switches and knob on the control head. This console-
mounted controller contains following control knobs.
Rotary Temperature Control Knob
•
Actuates by cable.
•
Raise the temperature of the air entering the vehicle
by sliding to the right or the red portion of the knob.
•
Varies the mix of the fresh air from outside the
vehicle with the heated air from inside the vehicle
to suit individual performance.
Rotary Mode Control Knob
•
Actuates by cable.
•
Re g ulat e s t he a ir dis t rib ut ion b e t we en t he
windshield, the instrument panel and the floor vents.
Rotary Blower Control Knob
•
Turn on to operate the blower motor at four speeds.
•
Turn OFF to stop the blower.
•
Operates completely independently from both the
mode control knob and temperature control knob.
•
Changes the fan speed in any mode and at any
speed.
SSANGYONG Y200
7C-4 MANUAL CONTROL HVAC SYSTEM
Compressor
Refrigerant
Oil
Receiver-Drier
A/C Condenser
Evaporator
A/C Pressure Sensor
A/C Cutoff Pressure
Type
Model
Displacement
Max. RPM
Type
Capacity
Type
Capacity
Material
Capacity
Max. Capacity
Size
Capacity
A/C ON/OFF
A/C ON/OFF
High Pressure
Low Pressure
Component
SPECIFICATIONS
6,000 - 7,500 rpm
R-134a
Synthetic PAG Oil
260 cc
Aluminum
260 cc
11,400 Kcal/h
263.0 x 228.6 x 88.9 mm
6,500 Kcal/h
305/425 psi
39/30 psi
32 Kgf/cm
2
4 Kgf/cm
2
Description
Single
Dual
Gasoline
Single
Dual
Gasoline
Single
Dual
V-5 Compressor
V-7 Compressor
10PAIRC
9.8 - 151 cc/rev
179 cc/rev
170.5 cc/rev
850 ± 50 g
1200 ± 50 g
High Pressure
Low Pressure
Variable Displacement
MANUAL CONTROL HVAC SYSTEM 7C-5
SSANGYONG Y200
1. Check the A/C fuse.
2. Check the operation of the blower motor and cooling fan.
3. Check the accessory belt.
4. Check the A/C condenser for restricted air flow.
5. Check the engagement of the compressor clutch.
6. Check the discharge air temperature with the A/C turned ON.
Are all above the operations normal?
1. Turn the ignition to LOCK.
2. Connect the high/low pressure gauges.
Are both pressures within the specified value?
1. If it’s above the specified value, discharge the refrigerant.
2. If it’s below the specified value, add 0.45kg (1 pound) of the
refrigerant and repair any leaks as needed.
3. Recover, evacuate and recharge the A/C system.
Is the repair complete?
1. Start the engine and allow it to run at idle.
2. Turn the A/C switch to ON.
3. Set the blower motor switch to 4th.
4. Set the temperature control lever to full cold.
Does the A/C compressor clutch engage?
1. Turn the ignition to LOCK.
2. Check the open or short in the compressor wiring.
Is there any open or short in the wiring?
Repair the faulty wiring as needed.
Is the repair complete?
Replace the compressor clutch coil.
Is the replacement complete?
Check for a knocking noise from the A/C compressor. Cycle the A/C
compressor ON and OFF in order to verify the source of the noise.
Do you hear a loud knocking noise?
1. Recover the A/C system refrigerant.
2. Replace the A/C compressor.
3. Evacuate and recharge the A/C system.
4. Check the A/C system for leaks.
Is the compressor running normally?
1. Close all of the windows and doors.
2. Set the A/C switch to ON position.
3. Set the intake air control switch to “Fresh Air”.
4. Set the blower motor switch to 4th.
5. Set the temperature control switch to full cold.
6. Keep it to run at idle for 5 minutes.
7. Check the temperature at the inlet/outlet of the evaporator.
Is there a noticeable difference in the temperature of the evaporator
inlet/outlet pipes?
DIAGNOSTIC INFORMATION AND PROCEDURES
INSUFFICIENT COOLING DIAGNOSIS
Step
1
2
3
4
5
6
7
8
9
10
Action
Yes
No
Go to Step 11
Go to Step 13
System OK
-
Go to Step 9
Go to Step 10
System OK
-
System OK
-
Go to Step 6
Go to Step 7
Go to Step 8
Go to Step 5
System OK
-
Go to Step 4
Go to Step 3
System OK
Go to Step 2
SSANGYONG Y200
7C-6 MANUAL CONTROL HVAC SYSTEM
Insufficient Cooling Diagnosis (Cont’d)
1. Recover the A/C system refrigerant.
2. Replace the expansion valve as needed.
3. Evacuate and recharge the A/C system.
4. Check the A/C system for leaks.
5. Operate the A/C system.
Is the discharge temperature normal?
1. Recover the refrigerant of the A/C system.
2. Evacuate and recharge the A/C system.
3. Check the A/C system for leaks.
Does the A/C system operate normally?
Feel the liquid pipe between the condenser and the expansion valve.
Is the pipe cold?
1. Repair any restriction in high pressure side.
2. Check the A/C system for leaks.
Does the A/C system operate normally?
1. Run the engine at 3,000 rpm.
2. Close all of the windows and doors.
3. Set the A/C switch to ON.
4. Set the blower motor switch to 4th.
5. Set the temperature control switch to full cold.
6. Turn the A/C switch ON and OFF every 20 seconds for 3 minutes.
7. Measure the compressor high and low pressure.
Are both pressures within the specified value?
Add the specified amount of the refrigerant to the A/C system.
Is the amount within the specified value?
1. Turn the ignition to LOCK.
2. Set the A/C switch to OFF position.
Can you turn the compressor clutch freely by hand?
1. Check the A/C system for leaks.
2. Repair any leaks as needed.
3. Evacuate and recharge the A/C system.
Does the A/C system operate normally?
1. Recover the refrigerant of the A/C system.
2. Evacuate and recharge the A/C system.
3. Check the A/C system for leaks.
4. Replace the compressor as needed.
Is the repair complete?
Action
Step
11
12
13
14
15
16
17
18
19
Yes
No
Go to Step 13
Go to Step 12
System OK
-
Go to Step 15
Go to Step 14
System OK
-
Go to Step 17
Go to Step 16
System OK
-
Go to Step 18
Go to Step 19
System OK
-
System OK
-
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