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Air Conditioning (A/C) System Performance Test

Table 1: A/C Performance Table

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

    • The current ambient air temperature
    • The current relative humidity
    • The high side pressure of the A/C system
    • The low side pressure of the A/C system
    • The temperature of the air being discharged into the passenger compartment

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  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 equalise for about 2 minutes.
  4. Turn OFF the ignition.
  5. Install the J-43600 ACR 2000 Air Conditioning Service Centre 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

    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 driver's door window 12.7-15.2 cm (5-6 in).
  3. Select the following HVAC control settings:
    4. • 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 centre panel air outlets.
  5. Apply the handbrake.
  6. Place the transaxle/transmission in one of the following positions:
    7. • 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:
    10. • Abnormal frost areas
    • Unusual noises
  10. Record the following information:
    11. • 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%

296-268 kPa (43-39 psi)

826-1198 kPa (120-174 psi)

9°C (48°F)

19-24°C (66-75°F)

Less than 40%

310-310 kPa (45-45 psi)

950-1329 kPa (138-193 psi)

12°C (52°F)

Greater than 40%

282-289 kPa (41-42 psi)

1019-1446 kPa (148-210 psi)

12°C (52°F)

25-29°C (76-85°F)

Less than 35%

275-296 kPa (40-43 psi)

1178-1502 kPa (145-190 psi)

12°C (52°F)

35-50%

268-296 kPa (39-43 psi)

1240-1557 kPa (180-226 psi)

12°C (52°F)

Greater than 50%

261-296 kPa (38-43 psi)

1281-1660 kPa (186-241 psi)

12°C (54°F)

30-35°C (86-95°F)

Less than 30%

254-275 kPa (37-40 psi)

1357-1708 kPa (197-248 psi)

12°C (52°F)

30-50%

254-289 kPa (37-42 psi)

1412-1791 kPa (205-260 psi)

13°C (54°F)

Greater than 50%

254-303 kPa (37-44 psi)

1481-1908 kPa (215-277 psi)

13°C (55°F)

36-41°C (96-105°F)

Less than 20%

227-248 kPa (33-36 psi)

1550-1887 kPa (225-274 psi)

10°C (50°F)

20-40%

234-268 kPa (34-39 psi)

1591-1977 kPa (231-287 psi)

13°C (54°F)

Greater than 40%

241-289 kPa (35-42 psi)

1667-2067 kPa (242-300 psi)

13°C (55°F)

42-46°C (106-115°F)

Less than 20%

199-227 kPa (29-33 psi)

1756-2067 kPa (255-300 psi)

10°C (50°F)

Greater than 20%

206-254 kPa (30-37 psi)

1812-2170 kPa (263-315 psi)

13°C (54°F)

47-49°C (116-120°F)

Below 30%

186-227 kPa (27-33 psi)

1991-2308 kPa (289-335 psi)

12°C (52°F)

   


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