For 1990-2009 cars

Table 1: | A/C Performance Table
Table 2: | Refrigerant-134a Pressure-Temperature Relationship

Important: Record the ambient temperature conditions and the relative humidity at the time of the test.

1. Park the vehicle inside or in the shade. The ambient temperature must be at least 21°C (70°F).
2. Open the windows in order to ventilate the interior.
3. Vent the engine exhaust.
4. Open the hood and install the high and low side pressure gauges of the J 39183-C .
5. Route the pressure gauge hoses and close the hood to the safety latch position.
6. Record the ambient temperature outside.
7. Record the relative humidity.
8. 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.
9. Open the A/C air outlet deflectors.
10. Place a J 6742-03 thermometer in the left center A/C outlet.
11. Place the transaxle in PARK and start the engine, stabilize the engine at 1500 RPM.
12. Run the A/C system about 5 minutes or until the outlet air reaches the lowest temperature.
13. Record the outlet air temperature and the high side and the low side pressures.
14. 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.

#### A/C Performance Table

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

#### Refrigerant-134a Pressure-Temperature Relationship

°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