LEMON Manuals: Even more car manuals for everyone
Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heating, Ventilation, And Air Conditioning >> Diagnostic Information and Procedures >> Air Conditioning (A/C) System Performance Test

Air Conditioning (A/C) System Performance Test

This test measures the operating efficiency of the A/C system under the following conditions:

Test Description 

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
NOTE:
  • 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  ACR2000 Air Conditioning Service Center.
  6. Record the ambient air temperature displayed on the J 43600  ACR2000 Air Conditioning Service Center.
  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 (Non HP2) 
2 
    NOTE:

    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 12.7-15.2cm (5-6in).
  3. Select the following HVAC control settings:
    • The A/C is ON.
    • The coldest temperature setting
    • The maximum blower speed
    • Recirculation mode
    • The instrument panel (I/P) panel outlet mode
    • All I/P panel outlets are OPEN.
  4. Install the temperature probes of the J 43600  ACR2000 Air Conditioning Service Center in the left and right center panel air outlets.
  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. NOTE:

    Press the RESET button, before using the print function of the J 43600  ACR2000 Air Conditioning Service Center.

  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 5  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  ACR2000 Air Conditioning Service Center and record the pressures and temperatures again.
  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 5  Go to Step 4 
4 Perform the necessary repairs. Refer to A/C Diagnostics Chart .
Is the action complete?		 - Go to Step 5  -
5 Operate the system in order to verify the test results.
Did you find the same results?		 - System OK Go to Symptoms - HVAC Systems - Automatic
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% 151-220 kPa (22-32 psi) 950-1102 kPa (138-160 psi) 8°C (45°F)
19-24°C (66-75°F) Below 40% 151-248 kPa (22-36 psi) 1178-1378 kPa (171-200 psi) 8°C (46°F)
Above 40% 165-268 kPa (24-39 psi) 1109-1336 kPa (161-194 psi) 12°C (52°F)
25-29°C (76-85°F) Below 35% 192-275 kPa (28-40 psi) 1329-1543 kPa (193-224 psi) 12°C (52°F)
35-50% 199-289 kPa (29-42 psi) 13209-1543 kPa (190-224 psi) 13°C (54°F)
Above 50% 213-310 kPa (31-45 psi) 1288-1543 kPa (187-224 psi) 14°C (57°F)
30-35°C (86-95°F) Below 30% 227-316 kPa (33-46 psi) 1460-1722 kPa (212-250 psi) 14°C (57°F)
30-50% 234-330 kPa (34-48 psi) 1460-1743 kPa (212-253 psi) 15°C (59°F)
Above 50% 248-351 kPa (36-51 psi) 1460-1777 kPa (212-258 psi) 18°C (63°F)
36-41°C (96-105°F) Below 20% 261-351 kPa (38-51 psi) 1619-1880 kPa (235-273 psi) 18°C (63°F)
20-40% 268-365 kPa (39-53 psi) 1632-1922 kPa (237-279 psi) 18°C (64°F)
Above 40% 282-378 kPa (41-55 psi) 1646-1970 kPa (239-286 psi) 19°C (66°F)
42-46°C (106-115°F) Below 20% 303-378 kPa (44-55 psi) 1770-2011 kPa (257-292 psi) 20°C (68°F)
Above 20% 310-399 kPa (45-58 psi) 1798-2080 kPa (261-302 psi) 22°C (70°F)
47-49°C (116-120°F) Below 30% 344-427 kPa (50-62 psi) 1929-2197 kPa (280-319 psi) 24°C (75°F)
scientia non olet · About LEMON Manuals