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

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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: A/C Refrigerant System Pressure Diagram

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Evaporator
Compressor, low pressure side -A-
Compressor, high pressure side -B-
Condenser
Receiver drier
High pressure service valve
Expansion valve
Low pressure service valve