A/C System Performance Test

The following test measures the A/C system operating efficiency by comparing:
^ The ambient air temperature
^ The ambient air humidity
^ The pressure at the high-pressure side of the refrigeration system
^ The pressure at the low-pressure side of the refrigeration system
^ The temperature of the air being discharged into the passenger compartment

Test Description

Steps 1-2:

Steps 3-8:

The number(s) below refer to the step number(s) on the diagnostic table.
1. This step determines if there is enough refrigerant in the A/C system in order to operate the system without damage.
2. This step measures the performance of the A/C system.
3. This step is to allow for vehicle variations as well as high ambient air temperatures.