Pressure-Temperature Relationship of R-134A
WARNING: This page is about a different car, the 2004 Suzuki Verona. However, it is still accessible from the selected car via links, so may be relevant.
Evaporator Range: From -7 to 7 °C (19.4 to 44.6 °F), the temperatures represent the gas temperatures inside the coil and not on the coil surfaces. Add 2 to 6 °C (4 to 11 °F) to the coil and air-off temperatures.
Condenser Range: From 45 to 70 °C (113 to 158 °F), the temperatures are not ambient. Add 19 to 22 °C (34 to 40 °C) to the ambient temperatures 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, which yields 1 379 kPa (200 psig), based on 50 km/h (31 mph) airflow.