Engine JAC HFC4DA1-2C. Instruction - page 96

AT

AT

AT

AT Air

Air

Air

Air Conditioner

Conditioner

Conditioner

Conditioner

- 173 -

Diagnosis and Testing

Refrigerant recovery

5.

The refrigerant recovery machine shall start to
recover refrigerant and lubricating oil from A/C
system, which respectively flows into a fluid
reservoir and a removable oil reservoir.

6.

Refrigerant recovery machine shall drain all
refrigerant out of A/C system, achieving partial
vacuum of A/C system with pressure at about 34
kPa (10 Hg).

7.

Once partial vacuum is realized, it is recommended
to turn off the refrigerant recovery machine and
two manual valves and record the pressure
readings. If the vacuum reading rises up to positive
pressure in 2 min, there is still surplus refrigerant
(after boiling) in the receiver drier; therefore, you
should continue to execute the reclaimer until no
obvious positive pressure rise occurs.

8.

Check the oil reservoir for oil recovery and record
the recovered volume, for the same volume of oil
shall be added into A/C system later.

AT

AT

AT

AT Air

Air

Air

Air Conditioner

Conditioner

Conditioner

Conditioner

- 174 -

Diagnosis

Diagnosis

Diagnosis

Diagnosis and

and

and

and Testing

Testing

Testing

Testing

A/C

A/C

A/C

A/C System

System

System

System Performance

Performance

Performance

Performance Table

Table

Table

Table

Engine

speed

(r/min)

Relative

humidity

(%)

Ambient air
temperature

Temperature of central

air vent

Pressure at low-pressure

side of pressure gauge

Pressure at high-pressure

side of pressure gauge

°F

°F

psi

kPa

psi

kPa

Idling

speed

20

59

15

37

3.00

27

162

142

943

68

20

37

3.00

31

185

168

1106

77

25

40

4.64

36

209

191

1296

86

30

47

8.60

42

236

225

1494

95

35

54

12.49

50

265

266

1653

104

40

62

16.45

58

300

304

1864

113

45

69

20.47

63

334

323

2155

40

59

15

37

3.00

25

171

139

956

68

20

38

3.50

28

197

164

1129

77

25

44

6.79

32

222

192

1323

86

30

52

11.27

36

252

209

1445

95

35

61

15.94

42

288

248

1709

104

40

69

20.76

48

329

279

1925

113

45

77

25.18

54

375

306

2110

60

59

15

37

3.00

26

177

140

966

68

20

40

4.47

30

205

166

1146

77

25

48

8.92

34

233

192

1326

86

30

57

13.93

39

269

215

1480

95

35

66

19.11

45

310

249

1718

104

40

76

24.59

52

358

300

2072

113

45

86

29.82

59

406

318

2196

80

59

15

37

3.00

27

186

142

976

68

20

43

6.11

31

214

168

1160

77

25

52

11.15

36

250

191

1320

86

30

62

16.95

42

289

225

1551

95

35

74

23.23

50

342

266

1833

104

40

85

29.27

58

398

304

2096

113

45

96

35.65

63

436

323

2226

AT

AT

AT

AT Air

Air

Air

Air Conditioner

Conditioner

Conditioner

Conditioner

- 175 -

Diagnosis

Diagnosis

Diagnosis

Diagnosis and

and

and

and Testing

Testing

Testing

Testing

A/C

A/C

A/C

A/C System

System

System

System Performance

Performance

Performance

Performance Table

Table

Table

Table

kPa

psi

kPa

psi

Definition: This table lists the pressure of refrigerant 134a under different temperature. For example, under room temperature of 26.6
℃ (80°F), the pressure of refrigerant reservoir reaches 595.6 kPa (86.4 psi). If the refrigerant is heated up to 51.6℃ (125°F), the
pressure shall rise up to 1278.8 kPa (185.5 psi). You can also determine the boiling point of refrigerant 134a based on different
pressure. For example, under the pressure of 188.2 kPa (27.3 psi), the boiling point of refrigerant R134a is 0℃ (32°F).

15.5

60

392.3

56.9

-23.3

-10

12.4

1.8

18.3

65

438.2

63.6

-20.5

-5

27.0

3.9

21.1

70

487.3

70.7

-17.7

0

43.2

6.3

23.8

75

539.7

78.3

15.0

5

60.8

8.8

26.6

80

595.6

86.4

-12.2

10

80.1

11.6

29.4

85

655.1

95.0

9.4

15

101.3

14.7

32.2

90

718.5

104.2

-6.6

20

124.3

18.0

35.0

95

785.6

113.9

-3.8

25

149.4

21.7

37.7

100

856.9

124.3

-1.1

30

176.6

25.6

40.5

105

932.3

135.2

0.0

32

188.2

27.3

43.3

110

1012.1

146.8

1.6

35

206.2

29.9

46.1

115

1096.4

159.0

4.4

40

238.0

34.5

48.8

120

1185.2

171.9

7.2

45

272.5

39.5

51.6

125

1278.8

185.5

10.0

50

309.5

44.9

54.4

130

1377.3

199.8

12.7

55

349.4

50.7

60.0

140

1589.6

230.5

AT

AT

AT

AT Air

Air

Air

Air Conditioner

Conditioner

Conditioner

Conditioner

- 176 -

Diagnosis

Diagnosis

Diagnosis

Diagnosis and

and

and

and Testing

Testing

Testing

Testing

A/C

A/C

A/C

A/C system

system

system

system performance

performance

performance

performance diagnosis

diagnosis

diagnosis

diagnosis

1.

Air heater performance diagnosis.

Step

Operation

Yes

No

1

Whether or not to conduct this diagnosis based on “ symptoms ” or
instruction of other diagnosis tables?

Go to Step 2.

2

①Start the engine.

②Let the engine idling.

Does the engine temperature reach normal operating temperature?

Go to Step 3.

Go to Step 9.

3

①Let the engine idling.

②Select “FLOOR” mode.

③Set the minimum speed of blower.

④Set the warmest temperature.

⑤Sense the temperature of inlet and outlet hoses at the heater core.

Is the inlet hose of heater warmer than the outlet hose?

Go to Step 7.

Go to Step 4.

4

①Place the temperature gauge at the central air vent.

②Fix the temperature gauge onto the outlet hose at the heater core.

③Set the maximum speed of blower.

④Set the warmest temperature.

⑤Record temperature at the position listed below:

Central air vent on instrument panel.

Outlet hose at the heater core.

⑥Compare the recorded temperatures.

Are these two temperatures nearly the same?

Go to Step 5.

Go to Step 6.

5

①Check the following parts of vehicle for cold air leak and conduct

relevant maintenance:

Front shield plate.

Internal circulation damper.

Air heater, ventilation and A/C system module housing.

②Conduct necessary maintenance.

Is the maintenance finished?

Go to Step 10.

6

①Check the operation of temperature damper.

②Conduct necessary maintenance.

Is the maintenance finished?

Go to Step 10.

7

①Shut down the engine.

②Backflush the heater core.

③Start the engine.

④Select “FLOOR” mode.

⑤Set the minimum speed of blower.

⑥Set the warmest temperature.

⑦Sense the temperature of inlet and outlet hoses at the heater core.

Is the inlet hose of heater warmer than the outlet hose?

Go to Step 8.

Go to Step 10.

8

Replace the heater core.

Is the maintenance finished?

Go to Step 10.

9

Troubleshoot too low engine temperature.

Is the maintenance finished?

Go to Step 10.

Рассказать друзьям