For 1990-2009 cars

## Air Conditioning (A/C) System Performance Test LNF First Design

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. This step measures the performance of the A/C system.

3. This step is to allow for vehicle variations as well as high ambient temperatures.

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.
6. Record the ambient air temperature displayed on the J 43600 .
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 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 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.
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

Important: Press the RESET button, before using the print function of the J 43600 .

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.
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

#### A/C System Pressure - Zone Classification

#### 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% | 151-206 kPa (22-30 psi) | 909-1322 kPa (132-192 psi) | 5°C (41°F)
19-24°C (66-75°F) | Below 40% | 151-213 kPa (22-31 psi) | 957-1371 kPa (139-199 psi) | 5°C (41°F)
Above 40% | 158-227 kPa (23-33 psi) | 1081-1502 kPa (157-218 psi) | 8°C (45°F)
25-29°C (76-85°F) | Below 35% | 165-227 kPa (24-33 psi) | 1198-1522 kPa (174-221 psi) | 8°C (45°F)
35-50% | 172-234 kPa (25-34 psi) | 1267-1570 kPa (184-228 psi) | 8°C (45°F)
Above 50% | 179-241 kPa (26-35 psi) | 1322-1646 kPa (192-239 psi) | 8°C (46°F)
30-35°C (86-95°F) | Below 30% | 186-248 kPa (27-36 psi) | 1391-1722 kPa (202-250 psi) | 9°C (48°F)
30-50% | 186-254 kPa (27-37 psi) | 1433-1770 kPa (208-257 psi) | 10°C (50°F)
Above 50% | 192-254 kPa (28-37 psi) | 1488-1832 kPa (216-266 psi) | 10°C (50°F)
36-41°C (96-105°F) | Below 20% | 206-261 kPa (30-38 psi) | 1598-1922 kPa (232-279 psi) | 12°C (52°F)
20-40% | 206-268 kPa (30-39 psi) | 1619-1949 kPa (235-283 psi) | 13°C (54°F)
Above 40% | 206-268 kPa (30-39 psi) | 1660-1977 kPa (241-287 psi) | 13°C (54°F)
42-46°C (106-115°F) | Below 20% | 227-282 kPa (33-41 psi) | 1818-2101 kPa (264-305 psi) | 13°C (55°F)
Above 20% | 227-282 kPa (33-41 psi) | 1839-2122 kPa (267-308 psi) | 13°C (55°F)
47-49°C (116-120°F) | Below 30% | 241-296 kPa (35-43 psi) | 2018-2287 kPa (293-332 psi) | 15°C (59°F)