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Home >> Pontiac >> 2008 >> Torrent GXP, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 90 (Heating, Ventilation, And Air Conditioning) >> Diagnostic Information and Procedures >> Air Conditioning (A/C) System Performance Test (LNJ) >> Test Description

Test Description

WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. 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.

  1. 1:  This step determines if the A/C system has at least the minimum refrigerant charge required to operate the system without damage.
  2. 2:  This step measures the performance of the A/C system.
  3. 3:  This step is to allow for vehicle variations as well as high ambient temperatures.
Step Action Values Yes No
IMPORTANT:
  • The ambient air temperature must be at least 16°C (60°F).
  • Do not induce additional air flow across the front of the vehicle during the test.
  • If you were sent here from a DTC diagnostic table, clear the DTC upon completion of this test.
1 
  1. Park the vehicle inside or in the shade.
  2. Update the ambient air temperature display. Refer to Ambient Air Temperature Display Updating .
  3. Open the windows in order to ventilate the interior of the vehicle.
  4. If the A/C system was operating, allow the A/C system to equalize for about 2 minutes.
  5. Turn OFF the ignition.
  6. Install the J 43600  . See Special Tools .
  7. Record the ambient air temperature displayed on the J 43600  . See Special Tools .
  8. Record the low and high side STATIC pressure readings.
Are both the low side and high side pressures within the specified value?		 More than 16°C (60°F) - 345 kPa (50 psi)
More than 24°C (75°F) - 483 kPa (70 psi)
More than 33°C (90°F) - 690 kPa (100 psi)		 Go to Step 2  Go to Leak Testing 
2 
    IMPORTANT: Record the relative humidity and the ambient air temperature at the time of the test.
  1. Close the vehicle doors and windows.
  2. Open the drivers door window 12.7-15.2 cm (5-6 in).
  3. Select the following HVAC control settings:
    • The A/C is ON
    • The coldest temperature setting
    • The maximum blower speed
    • Recirculation mode
    • The panel outlet mode
    • All panel outlets are OPEN
  4. Install the temperature probes of the J 43600  in the left and right center panel air outlets. See Special Tools .
  5. Apply the parking brake.
  6. Place the transaxle/transmission in PARK.
  7. Start the engine.
  8. Operate the A/C system for 5 minutes.
  9. Inspect A/C components for the following conditions:
    • Abnormal frost areas
    • Unusual noises
    10. IMPORTANT: Press the RESET button, before using the print function of the J 43600  . See Special Tools .
  10. Print the following information:
    • The panel outlet air temperatures
    • The low-side pressure
    • The high-side pressure
  11. Compare the low and high side pressures and the panel output temperatures to the A/C performance table below.
Does all the data recorded fall within the specified ranges of the A/C performance table?		 - Go to Step 8  Go to Step 3 
3  If the pressures and temperatures recorded do not fall within the specified ranges:
  1. Continue to operate the A/C system for an additional 5 minutes.
  2. RESET the J 43600  and record the pressures and temperatures again. See Special Tools .
  3. Compare the low and high side pressures and the panel output temperature to the A/C performance table.

Does all the data recorded fall within the specified ranges of the A/C performance table?		 - Go to Step 8  Go to Step 4 
4 Do the high and low side pressures fall within the specified ranges, but the panel outlet temperatures do not? - Go to Air Conditioning (A/C) Diagnostics - Pressure Zone A  Go to Step 5 
5 Is the low side pressure greater than the specified range, but the high side pressure within or less than the specified range? - Go to Air Conditioning (A/C) Diagnostics - Pressure Zone B  Go to Step 6 
6 Are the low and high side pressures both greater than the specified ranges? - Go to Air Conditioning (A/C) Diagnostics - Pressure Zone C  Go to Step 7 
7 Is the high side pressure greater than the specified range, but the low side pressure is within or less than the specified range? - Go to Air Conditioning (A/C) Diagnostics - Pressure Zone D  Go to Step 8 
8 Operate the system in order to verify the test results.
Did you find the same results?		 - System OK Go to Symptoms - HVAC Systems - Manual
Fig 1: Identifying Air Conditioning (A/C) Diagnostic Pressure Zone Graph (LNJ)
GM1974554Courtesy of GENERAL MOTORS CORP.
A/C Performance Table

Ambient Temperature Relative Humidity Low Side Service Port Pressure High Side Service Port Pressure Maximum Left Center Discharge Air Temperature
13-18°C (55-65°F) 0-100% 117-192 kPa (17-28 psi) 971-1322 kPa (141-192 psi) 8°C (46°F)
19-24°C (66-75°F) Below 40% 158-227 kPa (23-33 psi) 1019-1322 kPa (148-192 psi) 9°C (48°F)
Above 40% 137-261 kPa (20-38 psi) 999-1412 kPa (145-205 psi) 13°C (54°F)
25-29°C (76-85°F) Below 35% 186-254 kPa (27-37 psi) 1178-1433 kPa (171-208 psi) 13°C (54°F)
35-50% 179-261 kPa (26-38 psi) 1240-1557 kPa (180-226 psi) 13°C (55°F)
Above 50% 186-275 kPa (27-40 psi) 1260-1529 kPa (183-222 psi) 15°C (59°F)
30-35°C (86-95°F) Below 30% 192-282 kPa (28-41 psi) 1302-1653 kPa (189-240 psi) 14°C (57°F)
30-50% 213-303 kPa (31-44 psi) 1336-1715 kPa (194-249 psi) 17°C (61°F)
Above 50% 220-323 kPa (32-47 psi) 1378-1763 kPa (200-256 psi) 19°C (66°F)
36-41°C (96-105°F) Below 20% 227-303 kPa (33-44 psi) 1412-1688 kPa (205-245 psi) 18°C (63°F)
20-40% 234-323 kPa (34-47 psi) 1460-1729 kPa (212-251 psi) 19°C (66°F)
Above 40% 254-351 kPa (37-51 psi) 1488-1770 kPa (216-257 psi) 22°C (70°F)
42-46°C (106-115°F) Below 20% 254-323 kPa (37-47 psi) 1570-1812 kPa (228-263 psi) 19°C (66°F)
Above 20% 261-358 kPa (38-52 psi) 1612-1853 kPa (234-269 psi) 22°C (70°F)
47-49°C (116-120°F) Below 30% 275-365 kPa (40-53 psi) 1729-1998 kPa (251-290 psi) 23°C (73°F)
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