A/C Refrigerant System Pressures And Temperatures, Checking: Notes

The pressures and temperatures in the A/C system will vary depending on engine speed (RPM), Coolant Fan speed, engine coolant temperature, A/C Clutch engagement, outside temperature, humidity, etc.

Pressure and temperature specifications are based on the following:

• Engine speed (RPM) at 1500
• Fresh air blower on high speed
• A/C adjusted to Max. cooling

A = Low Pressure

B = High Pressure

Fig 1: Identifying A/C Refrigerant System Pressure Diagram

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

1. Evaporator
2. Compressor, low pressure side -A-
3. Compressor, high pressure side -B-
4. Condenser
5. Receiver drier
6. High pressure service valve
7. Expansion valve
8. Low pressure service valve