Initial Inspection and Diagnostic Overview

Air Conditioning (A/C) System Performance Test (LZE, LZ4, LGD)

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 number(s) below refer to the step number(s) 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 air temperatures.









A/C System Pressure - Zone Classification