Test Description

WARNING: This page is about a different car, the 2002 Pontiac Montana, 2002 Oldsmobile Silhouette, and 2002 Chevrolet Venture. 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 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 temperatures.

Fig 1: Air Conditioning (A/C) System Performance Test (1 Of 3)
Courtesy of GENERAL MOTORS CORP.

Fig 2: Air Conditioning (A/C) System Performance Test (2 Of 3)
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Fig 3: Air Conditioning (A/C) System Performance Test (3 Of 3)
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Fig 4: A/C System Pressure - Zone Classification
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Fig 5: A/C Performance Table
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Fig 6: A/C System Pressure - Zone Classification (with Rear A/C)
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Fig 7: A/C Performance Table - with Rear A/C
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Fig 8: Air Conditioning (A/C) Diagnostics - Pressure Zone A (1 Of 2)
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Fig 9: Air Conditioning (A/C) Diagnostics - Pressure Zone A (2 Of 2)
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Fig 10: Air Conditioning (A/C) Diagnostics - Pressure Zone B (1 Of 2)
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Fig 11: Air Conditioning (A/C) Diagnostics - Pressure Zone B (2 Of 2)
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Fig 12: Air Conditioning (A/C) Diagnostics - Pressure Zone C
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Fig 13: Air Conditioning (A/C) Diagnostics - Pressure Zone D (1 Of 3)
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Fig 14: Air Conditioning (A/C) Diagnostics - Pressure Zone D (2 Of 3)
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Fig 15: Air Conditioning (A/C) Diagnostics - Pressure Zone D (3 Of 3)
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Fig 16: Heating Performance Diagnostic (Front System)
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Fig 17: Heating Performance Diagnostic (Auxiliary System)
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Fig 18: Defrosting Insufficient
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Fig 19: Noise Diagnosis - Blower Motor (Front Blower Motor)
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Fig 20: Noise Diagnosis - Blower Motor (Auxiliary Blower Motor)
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Fig 21: Noise Diagnosis - Air Conditioning (A/C) System (1 Of 2)
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Fig 22: Noise Diagnosis - Air Conditioning (A/C) System (2 Of 2)
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Fig 23: Noise Diagnosis - HVAC Module
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Fig 24: Odor Diagnosis
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