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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 55 (Heating, Ventilation, And Air Conditioning System) >> Diagnostic Information and Procedures >> Air Conditioning (A/C) System Performance Test (LV1)

Air Conditioning (A/C) System Performance Test (LV1)

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. 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:

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  ACR 2000 Refrigerant Station.
  6. Record the ambient air temperature displayed on the J 43600  ACR 2000 Refrigerant Station.
  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 
    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 12.7-15.2 cm (5-6 inches).
  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.
    • The passenger side of a Dual Zone HVAC control module is turned OFF.
    • The coldest temperature setting on the auxiliary HVAC control assembly
    • The maximum blower speed selected on the auxiliary blower controls
  4. Install the temperature probes of the J 43600  ACR 2000 Refrigerant Station 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.
  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  ACR 2000 Refrigerant Station.

  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 table below.
Does all the data recorded fall within the specified ranges of the 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  ACR 2000 Refrigerant Station 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 - Manual
A/C Performance Table-Front Only

Ambient Air Temperature Relative Humidity Service Port Pressure Maximum Left Center Discharge Air Temperature
Low Side High Side
13-18°C (55-65°F) 0-100% 165-207 kPa (24-30 psi) 1206-1482 kPa (175-215 psi) 9°C (48°F)
19-24°C (66-75°F) Below 40% 165-207 kPa (24-30 psi) 1206-1482 kPa (175-215 psi) 9°C (48°F)
Above 40% 165-207 kPa (24-30 psi) 1206-1482 kPa (175-215 psi) 9°C (48°F)
25-29°C (76-85°F) Below 35% 165-207 kPa (24-30 psi) 1207-1482 kPa (175-215 psi) 9°C (48°F)
35-60% 165-207 kPa (24-30 psi) 1240-1517 kPa (180-220 psi) 9°C (48°F)
Above 60% 165-207 kPa (24-30 psi) 1240-1517 kPa (180-220 psi) 10°C (50°F)
30-35°C (86-95°F) Below 30% 240 -290 kPa (35-42 psi) 1448-1724 kPa (210-250 psi) 12°C (54°F)
30-50% 240 -290 kPa (35-42 psi) 1448-1724 kPa (210-250 psi) 12°C (54°F)
Above 50% 240 -290 kPa (35-42 psi) 1480-1760 kPa (215-255 psi) 13°C (56°F)
36-41°C (96-105°F) Below 20% 240-296 kPa (35-43 psi) 1690-2103 kPa (245-305 psi) 17°C (63°F)
20-40% 262-318 kPa (38-46 psi) 1790-2070 kPa (260-300 psi) 18°C (64°F)
Above 40% 276-331 kPa (40-48 psi) 1757-2035 kPa (255-295 psi) 19°C (66°F)
42-46°C (106-115°F) Below 20% 324-379 kPa (47-55 psi) 2034-2310 kPa (295-335 psi) 21°C (70°F)
Above 20% 345-400 kPa (50-58 psi) 2103-2379 kPa (305-345 psi) 21°C (70°F)
47-49°C (116-120°F) Below 30% 372-427 kPa (54-62 psi) 2379-2655 kPa (345-385 psi) 23°C (73°F)
A/C Performance Table-With Rear A/C

Ambient Temperature Relative Humidity Low Side Service Port Pressure High Side Service Port Pressure Maximum Left Center Discharge Air Temperature Maximum Left Side Rear Discharge Air Temperature
13-18°C (55-65°F) 0-100% 186-228 kPa (27-33 psi) 1000-1276 kPa (145-185 psi) 9°C (48°F) 12°C (54°F)
19-24°C (66-75°F) Less than 40% 192-235 kPa (28-34 psi) 1034-1310 kPa (150-190 psi) 9°C (48°F) 13°C (55°F)
Greater than 40% 200-241 kPa (29-35 psi) 1069-1345 kPa (155-195 psi) 11°C (52°F) 14°C (57°F)
25-29°C (76-85°F) Less than 35% 227-269 kPa (33-39 psi) 1240-1517 kPa (180-220 psi) 14°C (57°F) 16°C (61°F)
35-60% 248-290 kPa (36-42 psi) 1310-1586 kPa (190-230 psi) 14°C (57°F) 16°C (61°F)
Greater than 60% 269-310 kPa (39-45 psi) 1310-1586 kPa (190-230 psi) 15°C (59°F) 16°C (61°F)
30-35°C (86-95°F) Less than 30% 296-338 kPa (43-49 psi) 1586-1862 kPa (230-270 psi) 18°C (64°F) 20°C (68°F)
30-50% 290-331 kPa (42-48 psi) 1586-1862 kPa (230-270 psi) 18°C (64°F) 20°C (68°F)
Greater than 50% 290-331 kPa (42-48 psi) 1586-1862 kPa (230-270 psi) 19°C (66°F) 21°C (70°F)
36-41°C (96-105°F) Less than 20% 310-365 kPa (45-53 psi) 1862-2137 kPa (270-310 psi) 19°C (66°F) 21°C (70°F)
20-40% 351-407 kPa (51-59 psi) 1931-2206 kPa (280-320 psi) 21°C (70°F) 23°C (73°F)
Greater than 40% 365-421 kPa (53-61 psi) 2068-2344 kPa (300-340 psi) 23°C (73°F) 24°C (75°F)
42-46°C (106-115°F) Less than 20% 400-441 kPa (58-64 psi) 2344-2620 kPa (340-380 psi) 24°C (75°F) 26°C (79°F)
Greater than 20% 427-470 kPa (62-68 psi) 2413-2690 kPa (350-390 psi) 24°C (75°F) 26°C (79°F)
47-49°C (116-120°F) Less than 30% 470-510 kPa (68-74 psi) 2517-2792 kPa (365-405 psi) 26°C (79°F) 28°C (83°F)
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