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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 641 (Heating, Ventilation, And Air Conditioning) >> Diagnostic Information and Procedures >> Air Conditioning (A/C) System Performance Test (RPO LSJ) >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. 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.
Air Conditioning (A/C) System Performance Test (RPO LSJ)

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. Open the windows in order to ventilate the interior of the vehicle.
  3. If the A/C system was operating, allow the A/C system to equalize for about 2 minutes.
  4. Turn OFF the ignition.
  5. Install the J 43600  ACR 2000 Air Conditioning Service Center. See Special Tools .
  6. Record the ambient air temperature displayed on the J 43600  . See Special Tools .
  7. 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 driver 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 I/P panel outlet mode
    • All I/P 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 one of the following positions:
    • PARK (Automatic)
    • NEUTRAL (Manual)
  7. Start the engine and warm to operating temperature.
  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 below?		 - 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 table below.

Does all the data recorded fall within the specified ranges of the table below?		 - 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: A/C System Pressure-Zone Classification Graph (RPO LSJ)
GM1641203Courtesy 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% 158-234 kPa (23-343 psi) 640-992 kPa (93-144 psi) 10°C (50°F)
19-24°C (66-75°F) Below 40% 151-220 kPa (22-32 psi) 702-1274 kPa (102-185 psi) 10°C (50°F)
Above 40% 172-241 kPa (25-35 psi) 792-1129 kPa (115-164 psi) 10°C (50°F)
25-29°C (76-85°F) Below 35% 172-234 kPa (25-34 psi) 909-1446 kPa (132-210 psi) 10°C (50°F)
35-50% 179-241 kPa (26-35 psi) 9577-1212 kPa (139-176 psi) 10°C (50°F)
Above 50% 186-248 kPa (27-36 psi) 992-1322 kPa (144-192 psi) 12°C (52°F)
30-35°C (86-95°F) Below 30% 186-241 kPa (27-35 psi) 1081-1371 kPa (157-199 psi) 13°C (55°F)
30-50% 186-248 kPa (27-36 psi) 11027-1378 kPa (160-200 psi) 13°C (55°F)
Above 50% 186-248 kPa (27-36 psi) 1129-1398 kPa (164-203 psi) 14°C (57°F)
36-41°C (96-105°F) Below 20% 186-254 kPa (27-37 psi) 1267-1550 kPa (184-225 psi) 13°C (55°F)
20-40% 199-261 kPa (29-38 psi) 1281-1550 kPa (186-225 psi) 14°C (57°F)
Above 40% 220-289 kPa (32-42 psi) 1288-1715 kPa (187-249 psi) 15°C (62°F)
42-46°C (106-115°F) Below 20% 213-268 kPa (31-39 psi) 1467-1722 kPa (213-250 psi) 15°C (59°F)
Above 20% 213-275 kPa (31-40 psi) 1467-1818 kPa (213-264 psi) 16°C (60°F)
47-49°C (116-120°F) Below 30% 234-303 kPa (34-44 psi) 1639-1977 kPa (238-287 psi) 19°C (65°F)
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