GM Service Manual Online
For 1990-2009 cars only

Relative Humidity(%)

Ambient Air Temperature

Low Side Pressure

Engine Speed (RPM)

Center Duct Air Temperature

High Side Pressure

°C

°F

Psi

Kpa

°C

°F

Psi

Kpa

20

21

70

26

179

2000

7

45

160

1103

27

81

24

165

8

46

212

1462

32

90

26

179

9

48

277

1910

38

100

33

228

14

57

333

2296

30

21

70

26

179

2000

7

45

160

1103

27

81

24

165

8

46

220

1517

32

90

27

186

10

50

283

1951

38

100

34

234

15

59

349

2406

40

21

70

26

179

2000

8

46

162

1117

27

81

26

179

9

48

227

1565

32

90

29

200

11

52

295

2034

38

100

37

255

17

63

364

2510

50

21

70

26

179

2000

8

46

162

1117

27

81

26

179

9

48

235

1620

32

90

32

221

13

55

304

2096

38

100

71

490

19

66

380

2620

60

21

70

27

186

2000

8

46

165

1138

27

81

26

179

9

48

246

1696

32

90

34

234

15

59

324

2234

38

100

44

303

22

72

393

2710

70

21

70

27

186

2000

9

48

171

1179

27

81

28

193

10

50

260

1793

32

90

36

248

16

61

330

2275

38

100

47

324

24

75

401

2765

80

21

70

27

186

2000

9

48

178

1227

27

81

30

207

12

54

266

1834

32

90

37

255

17

63

339

2337

90

21

70

27

186

2000

9

48

178

1227

27

81

30

207

12

54

272

1875

32

90

38

262

18

64

340

2344

Test Conditions: Doors and hood opened, A/C ON, Recirculation mode, full cool with maximum blower speed, no sunlight, wind velocity at 8 km/h (5 mph).