Were you sent here from the A/C System Performance Test?

Go to Step 2

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

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

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

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

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.

Do the listed conditions exist?

Go to Step 7

Go to Step 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.

Do the listed conditions exist?

Go to Step 8

Go to Too Hot in Vehicle in HVAC Systems - Automatic

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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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

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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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

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

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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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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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

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Symptoms - HVAC Systems - Automatic