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AUTOMOTIVE AIR CONDITIONING
TROUBLE SHOOTING GUIDE
TEMPERATURE AND PRESSURE
Below find a chart which can be useful to diagnose a system. As you know, there is a direct correlation between the temperature and the pressure of a gas. The chart below shows pressure at a given temperature. By using an infrared temperature gun and this chart you can take pressure readings at various points in the system for a very accurate diagnosis.
PRESSURE TEMPERATURE CHART*
*red denotes vacuum, black denotes psig
| F | C | HFC 134A | CFC-12 | F | C | HFC 134A | CFC-12 |
| -60 | -51.1 | 21.8 | 19.0 | 55 | 12.8 | 51.1 | 52.0 |
| -55 | -48.3 | 20.4 | 17.3 | 60 | 15.6 | 57.3 | 57.7 |
| -50 | -45.6 | 18.7 | 15.4 | 65 | 18.3 | 63.9 | 63.8 |
| -45 | -45.8 | 16.9 | 13.3 | 70 | 21.1 | 70.9 | 70.2 |
| -40 | -40.0 | 14.8 | 11.0 | 75 | 23.9 | 78.4 | 77.0 |
| -35 | - 37.2 | 12.5 | 8.4 | 80 | 26.7 | 86.4 | 84.2 |
| -30 | -34.4 | 9.8 | 5.5 | 85 | 29.4 | 94.9 | 91.8 |
| -25 | -31.7 | 6.9 | 2.3 | 90 | 32.2 | 103.9 | 99.8 |
| -20 | -28.9 | 3.7 | 0.6 | 95 | 35.0 | 113.5 | 108.3 |
| -15 | -26.1 | 0.0 | 2.4 | 100 | 37.8 | 123.6 | 117.2 |
| -10 | -23.3 | 1.9 | 4.5 | 105 | 40.6 | 134.3 | 126.6 |
| -5 | 20.6 | 4.1 | 6.7 | 110 | 43.3 | 145.6 | 136.4 |
| 0 | -17.8 | 6.5 | 9.2 | 115 | 46.1 | 157.6 | 146.8 |
| 5 | -15.0 | 9.1 | 11.8 | 120 | 48.9 | 170.3 | 157.7 |
| 10 | -12.2 | 12.0 | 14.6 | 125 | 51.7 | 183.6 | 169.1 |
| 15 | -9.4 | 15.0 | 17.7 | 130 | 54.4 | 197.6 | 181.0 |
| 20 | -6.7 | 18.4 | 21.0 | 135 | 57.2 | 212.4 | 193.5 |
| 25 | -3.9 | 22.1 | 24.6 | 140 | 60.0 | 227.9 | 206.6 |
| 30 | -1.1 | 26.1 | 28.5 | 145 | 62.8 | 244.3 | 220.3 |
| 35 | 1.7 | 30.4 | 32.6 | 150 | 65.6 | 261.4 | 234.6 |
| 40 | 4.4 | 35.0 | 37.0 | 155 | 68.3 | 279.5 | 249.5 |
| 45 | 7.2 | 40.0 | 41.7 | 160 | 71.1 | 298.4 | 265.1 |
| 50 | 10.0 | 45.3 | 46.7 | 165 | 73.9 | 318.3 | 281.4 |