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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