Test Description

This test measures the operating efficiency of the A/C system under the following conditions:

• 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

The numbers below refer to the step numbers on the diagnostic table.

1. This step determines if the A/C system has at least the minimum refrigerant charge required 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 temperatures.