Content .. 193 194 195 196 ..

Daewoo Matiz (2003 year). Manual - part 195

7B – 6 MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM

PRESSURE-TEMPERATURE RELATIONSHIP OF R-134A

ÁÁÁÁÁÁÁÁ

TEMPERATURE

C (

F)*

ÁÁÁÁÁÁÁÁÁ

PRESSURE

kPa (psig)*

ÁÁÁÁÁÁÁÁÁÁÁ

TEMPERATURE

C (

F)*

ÁÁÁÁÁÁÁÁÁ

PRESSURE

kPa (psig)*

ÁÁÁÁÁÁÁÁ

–8.89 (16)

ÁÁÁÁÁÁÁÁÁ

105.70 (15.33)

ÁÁÁÁÁÁÁÁÁÁÁ

37.78 (100)

ÁÁÁÁÁÁÁÁÁ

856.84 (124.27)

ÁÁÁÁÁÁÁÁ

–7.78 (18)

ÁÁÁÁÁÁÁÁÁ

114.87 (16.66)

ÁÁÁÁÁÁÁÁÁÁÁ

38.89 (102)

ÁÁÁÁÁÁÁÁÁ

886.56 (128.58)

ÁÁÁÁÁÁÁÁ

–6.67 (20)

ÁÁÁÁÁÁÁÁÁ

124.32 (18.03)

ÁÁÁÁÁÁÁÁÁÁÁ

40.00 (104)

ÁÁÁÁÁÁÁÁÁ

916.35 (132.98)

ÁÁÁÁÁÁÁÁ

–5.56 (22)

ÁÁÁÁÁÁÁÁÁ

134.11 (19.45)

ÁÁÁÁÁÁÁÁÁÁÁ

41.11 (106)

ÁÁÁÁÁÁÁÁÁ

947.92 (137.48)

ÁÁÁÁÁÁÁÁ

–4.44 (24)

ÁÁÁÁÁÁÁÁÁ

144.24 (20.92)

ÁÁÁÁÁÁÁÁÁÁÁ

42.22 (108)

ÁÁÁÁÁÁÁÁÁ

979.64 (142.08)

ÁÁÁÁÁÁÁÁ

–3.33 (26)

ÁÁÁÁÁÁÁÁÁ

154.65 (22.43)

ÁÁÁÁÁÁÁÁÁÁÁ

43.33 (110)

ÁÁÁÁÁÁÁÁÁ

1012.11 (146.79)

ÁÁÁÁÁÁÁÁ

–2.22 (28)

ÁÁÁÁÁÁÁÁÁ

165.48 (24.00)

ÁÁÁÁÁÁÁÁÁÁÁ

44.44 (112)

ÁÁÁÁÁÁÁÁÁ

1045.21 (151.59)

ÁÁÁÁÁÁÁÁ

–1.11 (30)

ÁÁÁÁÁÁÁÁÁ

176.65 (25.62)

ÁÁÁÁÁÁÁÁÁÁÁ

45.56 (114)

ÁÁÁÁÁÁÁÁÁ

1079.14 (156.51)

ÁÁÁÁÁÁÁÁ

0.00 (32)

ÁÁÁÁÁÁÁÁÁ

188.16 (27.29)

ÁÁÁÁÁÁÁÁÁÁÁ

46.67 (116)

ÁÁÁÁÁÁÁÁÁ

1113.75 (161.53)

ÁÁÁÁÁÁÁÁ

1.11 (34)

ÁÁÁÁÁÁÁÁÁ

200.02 (29.01)

ÁÁÁÁÁÁÁÁÁÁÁ

47.78 (118)

ÁÁÁÁÁÁÁÁÁ

1149.12 (166.66)

ÁÁÁÁÁÁÁÁ

2.22 (36)

ÁÁÁÁÁÁÁÁÁ

212.30 (30.79)

ÁÁÁÁÁÁÁÁÁÁÁ

48.89 (120)

ÁÁÁÁÁÁÁÁÁ

1185.18 (171.89)

ÁÁÁÁÁÁÁÁ

3.33 (38)

ÁÁÁÁÁÁÁÁÁ

224.98 (32.63)

ÁÁÁÁÁÁÁÁÁÁÁ

50.00 (122)

ÁÁÁÁÁÁÁÁÁ

1222.07 (177.24)

ÁÁÁÁÁÁÁÁ

4.44 (40)

ÁÁÁÁÁÁÁÁÁ

238.08 (34.53)

ÁÁÁÁÁÁÁÁÁÁÁ

51.11 (124)

ÁÁÁÁÁÁÁÁÁ

1259.72 (182.70)

ÁÁÁÁÁÁÁÁ

7.22 (45)

ÁÁÁÁÁÁÁÁÁ

272.49 (39.52)

ÁÁÁÁÁÁÁÁÁÁÁ

52.22 (126)

ÁÁÁÁÁÁÁÁÁ

1298.12 (188.27)

ÁÁÁÁÁÁÁÁ

10.00 (50)

ÁÁÁÁÁÁÁÁÁ

309.58 (44.90)

ÁÁÁÁÁÁÁÁÁÁÁ

53.33 (128)

ÁÁÁÁÁÁÁÁÁ

1337.35 (193.96)

ÁÁÁÁÁÁÁÁ

12.77 (55)

ÁÁÁÁÁÁÁÁÁ

349.51 (50.69)

ÁÁÁÁÁÁÁÁÁÁÁ

54.44 (130)

ÁÁÁÁÁÁÁÁÁ

1377.35 (199.76)

ÁÁÁÁÁÁÁÁ

15.56 (60)

ÁÁÁÁÁÁÁÁÁ

392.33 (56.90)

ÁÁÁÁÁÁÁÁÁÁÁ

57.22 (135)

ÁÁÁÁÁÁÁÁÁ

1480.91 (214.78)

ÁÁÁÁÁÁÁÁ

18.33 (65)

ÁÁÁÁÁÁÁÁÁ

438.18 (63.55)

ÁÁÁÁÁÁÁÁÁÁÁ

60.00 (140)

ÁÁÁÁÁÁÁÁÁ

1589.57 (230.54)

ÁÁÁÁÁÁÁÁ

21.11 (70)

ÁÁÁÁÁÁÁÁÁ

487.27 (70.67)

ÁÁÁÁÁÁÁÁÁÁÁ

62.78 (145)

ÁÁÁÁÁÁÁÁÁ

1703.62 (247.08)

ÁÁÁÁÁÁÁÁ

23.89 (75)

ÁÁÁÁÁÁÁÁÁ

539.67 (78.27)

ÁÁÁÁÁÁÁÁÁÁÁ

65.56 (150)

ÁÁÁÁÁÁÁÁÁ

1823.04 (264.40)

ÁÁÁÁÁÁÁÁ

26.67 (80)

ÁÁÁÁÁÁÁÁÁ

609.38 (88.38)

ÁÁÁÁÁÁÁÁÁÁÁ

68.33 (155)

ÁÁÁÁÁÁÁÁÁ

1948.04 (282.53)

ÁÁÁÁÁÁÁÁ

29.44 (85)

ÁÁÁÁÁÁÁÁÁ

655.09 (95.01)

ÁÁÁÁÁÁÁÁÁÁÁ

71.11 (160)

ÁÁÁÁÁÁÁÁÁ

2078.77 (301.49)

ÁÁÁÁÁÁÁÁ

32.22 (90)

ÁÁÁÁÁÁÁÁÁ

718.39 (104.19)

ÁÁÁÁÁÁÁÁÁÁÁ

73.89 (165)

ÁÁÁÁÁÁÁÁÁ

2215.29 (321.29)

ÁÁÁÁÁÁÁÁ

35.00 (95)

ÁÁÁÁÁÁÁÁÁ

785.61 (113.94)

ÁÁÁÁÁÁÁÁÁÁÁ

76.67 (170)

ÁÁÁÁÁÁÁÁÁ

2357.81 (341.96)

* All values rounded to two decimal places.

EVAPORATOR RANGE: From –6.67 to 7.22

C (20 to 45

F), the temperatures represent the gas temperatures inside

the coil and not on the coil surfaces. Add 1.67 to 5.56

C (3 to 10

F) the temperature for coil and air-off temperatures.

CONDENSER RANGE: From 110 to 160

F, temperatures are not ambient. Add 19.4 to 22.2

C (35 to 40

F) for proper

heat transfer, then refer to the pressure chart.

Example:

C (90

F) ambient temperature

+ 22

C (40

C (130

Condenser temperature = 1379 kPa (200 psig)
Based on 48.3 km/h (30 mph) air flow.

MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7B – 7

LEAK TESTING THE REFRIGERANT
SYSTEM

Test for leaks whenever you suspect a refrigerant leak in
the system. You should also test for leaks whenever you
perform a service operation which results in disturbing
the lines or the connections. Leaks are commonly found
at the refrigerant fittings or at the connections. Leaks are
commonly caused by the following problems:

Improper torque.

Damaged O-ring seals.

Dirt or lint on the O-ring seals.

Liquid Leak Detectors

Use a liquid leak detector solution on locations such as
fittings. Apply the solution to the area in question with
the swab that is supplied with the solution. Look for
bubbles to appear. This will indicate the existence and
location of any leak.

For areas where this is not practical, such as sections of
the evaporator and the condenser, an electronic leak de-
tector is more useful.

Electronic Leak Detectors

Follow the manufacturer’s instructions for calibration,
operation, and maintenance of an electronic leak detec-
tor. Battery condition is especially important to the accu-
racy of a portable model. Set the detector to R-134a
before beginning the test.

Important: Electronic leak detectors are sensitive to
windshield washing solutions, solvents and cleaners,
and certain vehicle adhesives.

Surfaces must be clean to prevent false readings. Make
sure that all surfaces are dry to prevent damage to the
detector.

General Testing Instructions

Follow the entire path of the refrigerant system.

Completely circle each joint at 25 to 50 mm (1 to 2
inches) per second.

Hold the probe tip within 6 mm (1/4 inch) of the sur-
face.

Do not block the air intake.

The audible tone changes from 1 to 2 clicks per second
into a solid alarm if there is a leak. Adjust the balance
control to maintain 1 to 2 clicks per second.

Test all of the following areas, even after one leak has
been confirmed:

Evaporator inlet and outlet.

Receiver-drier inlet and outlet.

Condenser inlet and outlet.

Brazed and welded areas.

Damaged areas.

Hose couplings.

Compressor rear head.

All fittings and joints.

Testing Service Ports/Access Valves

The sealing cap is the primary seal for the service ports.
This cap contains a special leak-free O-ring. Make sure
that this cap is not missing or loose. Always use the cor-
rect cap.

Testing the Evaporator Core

Leaks in the evaporator core are difficult to find. Test the
evaporator core using the following procedure:

1. Run the blower fan at speed setting 4 for at least

15 minutes.

2. Turn the blower to the OFF position.

3. Wait for 10 minutes.

4. Remove the blower motor resistor. Refer to “Blower

Motor Resistor” in this section.

5. Insert the leak detector probe as close as possible to

the evaporator core. The detector will indicate a leak
with a solid alarm.

6. Use a flashlight to search for refrigerant oil in the core

surface.

Testing the Compressor Shaft Seal

1. Blow shop air behind and in front of the compressor

clutch/pulley for at least 15 seconds.

2. Wait 1 to 2 minutes.

3. Probe the area in front of the pulley. If the detector

emits a solid alarm, there is a leak.

7B – 8 MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM

AIR CONDITIONING SYSTEM DIAGNOSIS

INSUFFICIENT COOLING DIAGNOSIS

ÁÁÁÁ

Step

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Action

ÁÁÁÁÁ

Value(s)

ÁÁÁÁÁÁÁ

Yes

ÁÁÁÁÁÁ

Can you verify the customer complaint?

–

Go to Step 2

System OK

1. Check the fuses Ef14, Ef19, and Ef12.
2. Check the blower fan operation.
3. Check the engine cooling fan operation.
4. Check the A/C compressor belt.
5. Check the A/C condenser for restricted air flow.
6. Check the slippage of the compressor clutch.
7. Repair or replace any components as needed.
8. Check the A/C system operation.
Is the A/C system operation normal?

–

System OK

Go to Step 3

1. Turn the ignition switch OFF.
2. Connect the high and the low pressure gauges.
Are both pressures within the value specified?

Low Side

Go to Step 8

Go to Step 6

Are both pressures above the specified value?

Pressure:

Go to Step 5

–

Are both pressures within the specified value?

200 kPa

(29 Psi)

Go to Step 8

–

Are both pressure below the specified value?

(29 Psi)

Go to Step 7

Go to Step 4

1. Add the refrigerant R–134a.
2. Check the A/C system for leaks.
3. Repair any refrigerant leaks as needed.
4. Recover, evacuate, and recharge the A/C system.
Are both pressure within the specified value?

High Side
Pressure:

1,500 kPa

(217.5 Psi)

Go to Step 8

–

1. Start the engine and allow it to run at idle.
2. Set the A/C controls to following positions.

The A/C switch to the ON position.

The fresh air control switch to fresh air.

The blower motor to 4.

The temperature to full cold.

Does the A/C compressor clutch engage?

–

Go to Step 9

Go to Step 11

1. Check for a knocking noise from the A/C

compressor.

2. Cycle the A/C compressor ON and OFF in order

to verify the source of the noise.

Do you hear a loud knocking noise?

–

Go to Step 10

Go to Step 14

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 repair complete?

–

Go to Step 14

–

1. Turn the ignition switch OFF.
2. Disconnect the A/C compressor clutch coil

connector.

3. Connect a jumper wire from ground to one A/C

compressor clutch coil terminal.

4. Connect a fused jumper wire from the positive

battery terminal to the other A/C compressor
clutch coil terminal.

Does the A/C clutch engage?

–

Go to Step 12

Go to Step 13

MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7B – 9

Insufficient Cooling Diagnosis (Cont’d)

ÁÁÁÁ

Step

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Action

ÁÁÁÁÁ

Value(s)

ÁÁÁÁÁÁÁ

Yes

ÁÁÁÁÁÁ

Repair the electrical circuit to the A/C compressor
clutch coil.
Does the A/C clutch engage?

–

Go to Step 20

Go to Step 13

Replace the A/C compressor clutch coil.
Does the A/C clutch engage?

–

Go to Step 9

Go to Step 10

Important: Perform this test under garage condi-
tions; 21-32

C (70-90

F) and no sun load. Follow

this test carefully for accurate results.
1. Close all of the windows and the doors of the

vehicle.

2. Set the A/C controls to the following positions:

The A/C switch to the ON position.

The fresh air control switch to fresh air.

The blower motor to 4.

The temperature to full cold.

3. Start the engine and follow it to run at idle for

5 minutes.

4. Feel the evaporator inlet and outlet pipes.
Is there a noticeable difference in the temperature of
the evaporator inlet and outlet pipes?

–

Go to Step 16

Go to Step 15

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. Note the discharge air temperature with the A/C

ON.

Is the discharge temperature normal?

–

Go to Step16

Go to Step 18

Feel the liquid pipe between the condenser and the
expansion valve.
Is the pipe cold?

–

Go to Step 19

Go to Step 17

1. Remove the restriction of the high pressure side.
2. Check the A/C system for leaks.
Is the repair complete?

–

System OK

–

1. Recover the A/C system refrigerant.
2. Evacuate and recharge the A/C system.
3. Check the A/C system for leaks.
Is the repair complete?

–

System OK

–

1. Run the engine at 3,000 rpm.
2. Close all of the windows and doors of the vehicle.
3. Set the A/C controls to the following positions:

The A/C switch to the ON position.

The fresh air control switch to fresh air.

The blower motor to 4.

The temperature to full cold.

4. Turn the A/C switch ON and OFF every

20 seconds for 3 minutes.

Are the A/C compressor high and the low side
pressures within the specified value of each other?

Low Side

Pressure:

200 kPa

(29 psi)

High Side
Pressure:

1,500 kPa

(217.5 psi)

System OK

Go to Step 22

Content .. 193 194 195 196 ..