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How cold should the car ac be

How cold should the car ac be

The car ac should be as cold as the manufacturer design specifications according to the heat load, humidity, and other conditions of the vehicle at the time of the performance test. There is a relationship between Humidity, ambient air temperature, pressures and the type of refrigerant used in the auto a/c system that will ultimately dictate what the center duct air temperature in your car should be. In this chart  of Relative humidity/ambient air temperature/pressure for r134a we can determine what should be the car ac temperature at the vents. If the vehicle is under these specific conditions of ambient outside air temperature and humidity and the Center Duct air temperature is not close to these values, there is a problem with the car a/c system that must be fixed.

Relative Humidity

Ambient Air Temp (F)

Max Gauge Pres Low Side (psi)

Max Gauge Pres High Side (psi)

Center Duct Air Temp (F)

 

40%

70

37

260

48

80

37

305

54

90

42

370

61

100

49

395

66

 

50%

70

37

275

52

80

39

320

57

90

46

375

64

100

55

430

72

 

60%

70

37

290

54

80

42

340

48

90

49

390

68

100

60

445

79

Temperature /Humidity/Pressure Relationships for R134a.

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