| Table 1: | A/C Performance Table |
| Table 2: | Refrigerant-134a Pressure-Temperature Relationship |
- Park the vehicle inside or in the shade. The ambient temperature must be at least 21°C (70°F).
- Open the windows in order to ventilate the interior.
- Vent the engine exhaust.
- Open the hood and install the high and low side pressure gauges of the J 39183-C .
- Route the pressure gauge hoses and close the hood to the safety latch position.
- Record the ambient temperature outside.
- Record the relative humidity.
- Turn the A/C on, set the mode to the VENT position, the temperature to the coldest position, the fresh/recirc to recirculation, the blower speed to high and open the windows.
- Open the A/C air outlet deflectors.
- Place a J 6742-03 thermometer in the left center A/C outlet.
- Place the transaxle in PARK and start the engine, stabilize the engine at 1500 RPM.
- Run the A/C system about 5 minutes or until the outlet air reaches the lowest temperature.
- Record the outlet air temperature and the high side and the low side pressures.
- Turn the engine off and compare the readings with the data in the A/C Performance Table. A normally operating A/C system should not exceed levels shown. If the readings exceed the table limits, refer to VDOT Air Conditioning (A/C) System Diagnosis . Also refer to Symptoms - HVAC Systems - Manual in HVAC Systems - Manual.
Important: Record the ambient temperature conditions and the relative humidity at the time of the test.
Engine Speed (rpm) | Relative Humidity (%) | Ambient Air Temperature | Left Center Air Outlet Temperature | Low Side Pressure | High Side Pressure | ||||
|---|---|---|---|---|---|---|---|---|---|
°F | °C | °F | °C | psig | kPa | psig | kPa | ||
1500 | 40 | 70 | 21 | N/A | N/A | N/A | N/A | N/A | N/A |
80 | 27 | 50 | 10 | 32 | 0 | 240 | 1655 | ||
90 | 32 | 57 | 14 | 40 | 4 | 281 | 1937 | ||
100 | 38 | 64 | 18 | 46 | 8 | 319 | 2200 | ||
110 | 43 | 71 | 22 | 55 | 13 | 367 | 2530 | ||
115 | 46 | 76 | 25 | 63 | 17 | 445 | 3068 | ||
80 | 70 | 21 | 49 | 10 | 32 | 0 | 229 | 1579 | |
80 | 27 | 57 | 14 | 39 | 4 | 260 | 1793 | ||
90 | 32 | 64 | 18 | 48 | 9 | 297 | 2048 | ||
100 | 38 | 75 | 24 | 62 | 17 | 381 | 2627 | ||
110 | 43 | 83 | 28 | 70 | 21 | 425 | 2930 | ||
115 | 46 | N/A | N/A | N/A | N/A | N/A | N/A | ||
°C | °F | kPa | psig | °C | °F | kPa | psig |
|---|---|---|---|---|---|---|---|
DEFINITION: This table indicates the pressure of the Refrigerant-134a at various temperatures. For instance, a drum of refrigerant at room temperature of 26.6°C (80°F) will have a pressure of 595.6 kPa (86.4 psi). If the refrigerant is heated to 51.6°C (125°F), the pressure will increase to 1278.8 kPa (185.5 psi). The refrigerant also can be used conversely in order to determine the temperature at which the Refrigerant-134a boils under various pressures. For example, at a pressure of 188.2 kPa (27.3 psi), the Refrigerant-134a boils at 0°C (32°F). | |||||||
15.5 | 60 | 392.3 | 56.9 | ||||
-23.3 | -10 | 12.4 | 1.8 | 18.3 | 65 | 438.2 | 63.6 |
-20.5 | -5 | 27.0 | 3.9 | 21.1 | 70 | 487.3 | 70.7 |
-17.7 | 0 | 43.2 | 6.3 | 23.8 | 75 | 539.7 | 78.3 |
15.0 | 5 | 60.8 | 8.8 | 26.6 | 80 | 595.6 | 86.4 |
-12.2 | 10 | 80.1 | 11.6 | 29.4 | 85 | 655.1 | 95.0 |
9.4 | 15 | 101.3 | 14.7 | 32.2 | 90 | 718.5 | 104.2 |
-6.6 | 20 | 124.3 | 18.0 | 35.0 | 95 | 785.6 | 113.9 |
-3.8 | 25 | 149.4 | 21.7 | 37.7 | 100 | 856.9 | 124.3 |
-1.1 | 30 | 176.6 | 25.6 | 40.5 | 105 | 932.3 | 135.2 |
0.0 | 32 | 188.2 | 27.3 | 43.3 | 110 | 1012.1 | 146.8 |
1.6 | 35 | 206.2 | 29.9 | 46.1 | 115 | 1096.4 | 159.0 |
4.4 | 40 | 238.0 | 34.5 | 48.8 | 120 | 1185.2 | 171.9 |
7.2 | 45 | 272.5 | 39.5 | 51.6 | 125 | 1278.8 | 185.5 |
10.0 | 50 | 309.5 | 44.9 | 54.4 | 130 | 1377.3 | 199.8 |
12.7 | 55 | 349.4 | 50.7 | 60.0 | 140 | 1589.6 | 230.5 |
