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 panel air outlet temperatures recorded during the A/C system performance test.

Is there a 2-3 degree difference or more in the discharge air temperature between the right and left center panel air 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 2,000 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 - Manual

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

--

The A/C system may be contaminated.

View the J 43600 ACR 2000 Air Conditioning Service Center. Refrigerant Station 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

--

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 A/C refrigerant oil.

1. Recover the A/C refrigerant from the A/C system. Refer to Refrigerant Recovery and Recharging .
2. Remove the accumulator. Refer to Air Conditioning Accumulator Replacement .
3. Drain and measure the A/C refrigerant oil from the accumulator.

Was there more than 148 ml (5 oz) of A/C refrigerant oil drained from the accumulator?

Go to Step 12

Go to Step 13

1. Reinstall the accumulator. Refer to Air Conditioning Accumulator Replacement .
2. Flush the A/C system. Refer to Flushing .
3. Add the specified amount of A/C refrigerant oil to the accumulator. 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

--

1. Add the specified amount of A/C refrigerant oil to the accumulator. Refer to Refrigerant System Capacities .
2. Install the accumulator. Refer to Air Conditioning Accumulator Replacement .
3. Recharge the A/C system. Refer to Refrigerant Recovery and Recharging .

Are the repairs complete?

Go to Step 14

--

1. Record the low and high side pressures and the IP panel 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 IP panel outlet temperatures within specifications?

Go to Step 15

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

Operate the A/C system in order to verify the repair.

Did you correct the condition?

System OK

Go to Symptoms - HVAC Systems - Manual in HVAC Systems-Manual