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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  ACR 2000 Air Conditioning Service Center or GE-48800  CoolTech A/C Recharge Machine.
  6. Record the ambient air temperature and humidity.
  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 
  1. Close the vehicle doors and windows.
    NOTE: Record the relative humidity and the ambient air temperature at the time of the test.
  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 instrument panel (I/P) outlet mode
    • All I/P outlets are OPEN.
  4. Install thermometers 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. Record 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. Record the pressures and temperatures again.
  3. Compare the low and high side pressures and the panel output temperature 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 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% 151-213 kPa (22-31 psi) 840-1026 kPa (122-149 psi) 7°C (43°F)
19-24°C (66-75°F) Less than 40% 151-241 kPa (22-35 psi) 1123-1378 kPa (163-200) 9°C (48°F)
Greater than 40% 158-268 kPa (23-39 psi) 1047-1336 kPa (152-194 psi) 12°C (52°F)
25-29°C (76-85°F) Less than 35% 186-275 kPa (27-40 psi) 1322-1591 kPa (192-231 psi) 13°C (55°F)
35-50% 199-289 kPa (29-42 psi) 1302-1591 kPa (189-231 psi) 13°C (55°F)
Greater than 50% 206-310 kPa (30-45 psi) 1288-1598 kPa (187-232 psi) 15°C (59°F)
30-35°C (86-95°F) Less than 30% 220-316 kPa (32-46 psi) 1502-1818 kPa (218-264 psi) 15°C (59°F)
30-50% 227-330 kPa (33-48 psi) 1502-1853 kPa (218-269 psi) 18°C (63°F)
Greater than 50% 248-358 kPa (36-52 psi) 1508-1901 kPa (219-276 psi) 19°C (66°F)
36-41°C (96-105°F) Less than 20% 254-351 kPa (37-51 psi) 1708-2018 kPa (248-293 psi) 18°C (64°F)
20-40% 261-365 kPa (38-53 psi) 1722-2087 kPa (250-303 psi) 20°C (68°F)
Greater than 40% 282-385 kPa (41-56 psi) 1756-2149 kPa (255-312 psi) 23°C (72°F)
42-46°C (106-115°F) Less than 20% 296-385 kPa (43-56 psi) 1908-2211 kPa (277-321 psi) 20°C (68°F)
Greater than 20% 310-406 kPa (45-59 psi) 1942-2287 kPa (282-332 psi) 23°C (73°F)
47-49°C (116-120°F) Below 30% 344-434 kPa (50-63 psi) 2129-2452 kPa (309-356 psi) 25°C (77°F)
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