A/C Refrigerant System Pressures and Temperatures, Checking

A/C Refrigerant System Pressures and Temperatures, Checking

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





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

Pressure and Temperature Specifications





1)Pressure maintained in the refrigerant system by the variable displacement compressor despite variables in temperature, load and engine speeds (RPM)

2)Temperature maintained in the refrigerant system by the variable displacement compressor despite variables in temperature, load and engine speeds (RPM).