Test Description

WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers 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 (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 Chart

Courtesy of GENERAL MOTORS CORP.