Air Conditioning (A/C) System Performance Test

Air Conditioning (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

Step 1:

Step 2 - Step 5:

Step 6 - Step 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.

A/C System Pressure - Zone Classification