A/C System Performance Test

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

Test Description

Step 1:

Steps 2-5:

Steps 6-8:

The numbers below refer to the step numbers 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.