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Insufficient Cooling - Quick Check Procedure

Perform the following hand-feel procedure to get a quick idea of whether the air conditioning (A/C) system has the proper charge of Refrigerant-134a. The air temperature must be above 21°C (70°F) for most models.

  1. Warm up engine. Run the engine at idle.
  2. Open the hood and all the doors.
  3. Turn the A/C switch ON.
  4. Set the temperature control to the full cold position.
  5. Set the blower speed switch on 4.
  6. Hand-feel the temperature of the evaporator outlet pipe. The pipe should be cold.
  7. Inspect for other problems. Refer to HVAC Preliminary Checks .
  8. Leak check the system. Refer to Leak Testing . If you find a leak, discharge the system and repair the leak as required. After completing the repair, evacuate and charge the system.
  9. If there is no leak, refer to Too Hot in Vehicle .
Pressure Temperature Relationship of R-134A

°C °F kPa psi °C °F kPa psi
*All values rounded to 2 decimal places.
EVAPORATOR RANGE: From -6.67 to +7.22°C (20-45°F), the temperatures represent the gas temperatures inside the coil and not on the coil surfaces. Add 1.67-5.56°C (3-10°F) to the temperature for coil and air-off temperatures.
CONDENSER RANGE: From 43-71°C (110-160°F), temperatures are not ambient. Add 19.4-22.2°C (35-40°F) for proper heat transfer, then refer to the pressure chart.
Example: 32°C (90°F) ambient temperature +22°C (40°F) = 54°C (130°F). Condenser temperature = 1 379 kPa (200 psi), based on 48.3 km/h (30 mph) airflow.
-8.89 16 105.70 15.33 37.78 100 856.84 124.27
-7.78 18 114.87 16.66 38.89 102 886.56 128.58
-6.67 20 124.32 18.03 40 104 916.35 132.98
-5.56 22 134.11 19.45 41.11 106 947.92 137.48
-4.44 24 144.24 20.92 42.22 108 979.64 142.08
-3.33 26 154.65 22.43 43.33 110 1012.11 146.79
-2.22 28 165.48 24 44.44 112 1045.21 151.59
-1.11 30 176.65 25.62 45.56 114 1079.14 156.51
0 32 188.16 27.29 46.67 116 1113.75 161.53
1.11 34 200.02 29.01 47.78 118 1149.12 166.66
2.22 36 212.30 30.79 48.89 120 1185.18 171.89
3.33 38 224.98 32.63 50 122 1222.07 177.24
4.44 40 238.08 34.53 51.11 124 1259.72 182.70
7.22 45 272.49 39.52 52.22 126 1298.12 188.27
10 50 309.58 44.9 53.33 128 1337.35 193.96
12.77 55 349.51 50.69 54.44 130 1377.35 199.76
15.56 60 392.33 56.9 57.22 135 1480.91 214.78
18.33 65 438.18 63.55 60 140 1589.57 230.54
21.11 70 487.27 70.67 62.78 145 1703.62 247.08
23.89 75 539.67 78.27 65.56 150 1823.04 264.4
26.67 80 609.38 88.38 68.33 155 1948.04 272.53
29.44 85 655.09 95.01 71.11 160 2078.77 301.49
32.22 90 718.39 104.19 73.89 165 2215.29 321.29
35 95 785.61 113.94 76.67 170 2357.81 341.96
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