Test Description

WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

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.

This step determines if the A/C system has at least the minimum refrigerant charge required to operate the system without damage.
This step measures the performance of the A/C system.
This step is to allow for vehicle variations as well as high ambient air temperatures.

Fig 1: Air Conditioning (A/C) System Performance Test (Steps 1 - 2)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Air Conditioning (A/C) System Performance Test (2 Steps 3 - 8)

Courtesy of GENERAL MOTORS CORP.

Fig 3: A/C System Pressure - Zone Classification Graph

Courtesy of GENERAL MOTORS CORP.

Fig 4: A/C Performance Table

Courtesy of GENERAL MOTORS CORP.