For 1990-2009 cars

Step | Action | Yes | No
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1 | Were you sent here from the A/C System Performance Test? | Go to Step 2 | Go to Air Conditioning (A/C) System Performance Test
2 | Refer to the air outlet temperatures recorded during the A/C system performance test. Is there a 2-3° difference or more in the discharge air temperature between the right and left center I/P outlets? | Go to Step 7 | Go to Step 3
3 | Did the customer concern mention that the A/C system output temperatures are good at first, but then turn warm during extended drives? | Go to Step 4 | Go to Step 5
4 | Increase engine speed to 2000 RPM. During extended operation of the A/C system, does the low side pressure decrease (possibly accompanied by heavy frost on the liquid line between the expansion device and the evaporator)? | Go to Air Conditioning (A/C) Diagnostics - Pressure Zone D | Go to Step 5
5 | Refer to the pressures recorded during the A/C system performance test. Inspect for the following conditions: Caution: Refer to Moving Parts and Hot Surfaces Caution in the Preface section.

• | The high side pressure slightly above the specified pressure ranges but still within zone A on the A/C Pressure-Zone Classification Chart in the A/C System Performance Test. Refer to Air Conditioning (A/C) System Performance Test .

• | The discharge line is hot

• | The suction line is cool

Do the listed conditions exist?

Go to Step 7

Go to Step 6

6 | Refer to the pressures recorded during the A/C system performance test. Inspect for the following conditions: Caution: Refer to Moving Parts and Hot Surfaces Caution in the Preface section.

• | The low side pressure slightly lower than the specified pressure ranges but still within zone A on the A/C Pressure-Zone Classification Chart in the A/C System Performance Test. Refer to Air Conditioning (A/C) System Performance Test .

• | The discharge line is warm-to-hot

• | The suction line is cool-to-warm

Do the listed conditions exist?

Go to Step 8

Go to Too Hot in Vehicle in HVAC Systems - Automatic

7 | The A/C system may be undercharged.

1. Leak test A/C system. Refer to Leak Testing .
2. Recharge the A/C system to specifications. Refer to Refrigerant Recovery and Recharging .

Is the repair complete?

Go to Step 14

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8 | The A/C system may be contaminated. View the J 43600 information screen for detection of foreign gases in the A/C system. Do foreign gases exist? | Go to Step 9 | Go to Step 10
9 |

1. Evacuate the A/C system to a scavenging tank.

Refer to Refrigerant Recovery and Recharging .

2. Recharge the A/C system to specifications.

Is the repair complete?

Go to Step 14

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10 | The A/C system may contain too much moisture or air.

1. Evacuate and recharge the A/C system to specifications. Refer to Refrigerant Recovery and Recharging .
2. Operate the A/C system and check the outlet air temperatures. Refer to Air Conditioning (A/C) System Performance Test .

Are the outlet temperatures within the specified ranges of the A/C Performance Test Table?

Go to Step 15

Go to Step 11

11 | The A/C system may contain too much refrigerant oil.

Important: Operate the A/C system on low, in order to enhance oil flow to the high side of the system.

1. Operate the A/C system with the engine at idle speed and the blower speed on low for approximately 15 minutes.
2. Recover the refrigerant from the A/C system. Refer to Refrigerant Recovery and Recharging .
3. Remove the receiver dehydrator. Refer to Receiver Dehydrator Replacement .
4. Drain and measure the refrigerant oil from the receiver dehydrator.

Was there more than 5 oz. of refrigerant oil drained from the receiver?

Go to Step 12

Go to Step 13

12 |

1. Reinstall the receiver dehydrator. Refer to Receiver Dehydrator Replacement .
2. Flush the A/C system. Refer to the operating manual of the J 43600 for the flushing procedure.
3. Add the specified amount of refrigerant oil to the receiver. Refer to Refrigerant System Capacities .
4. Recharge the A/C system. Refer to Refrigerant Recovery and Recharging .

Are the repairs complete?

Go to Step 14

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13 |

1. Add the specified amount of refrigerant oil to the receiver. Refer to Refrigerant System Capacities .
2. Install the receiver dehydrator. Refer to Receiver Dehydrator Replacement .
3. Recharge the A/C system. Refer to Refrigerant Recovery and Recharging .

Are the repairs complete?

Go to Step 14

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14 |

1. Record the low and high side pressures and the IP outlet air temperature.
2. Compare the outlet temperatures to those listed in the A/C System Performance Chart. Refer to Air Conditioning (A/C) System Performance Test .

Are the high and low side pressures and outlet temperatures within specifications?

Go to Step 15

Go to Air Conditioning (A/C) System Performance Test

15 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Symptoms - HVAC Systems - Automatic