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

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Go to Step 2

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

Caution: Refer to Moving Parts and Hot Surfaces Caution in the Preface section.

Feel the liquid line before the expansion device.

Is the liquid line cold before the expansion device?

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Go to Step 3

Go to Step 8

Feel along the surfaces of the following high side components :

Did you detect an abrupt drop in temperature noted along the surfaces of any of the listed components?

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Go to Step 7

Go to Step 4

1. Feel the liquid line at the expansion device location for extreme cold, possibly accompanied by heavy frost.
2. Feel along the liquid line after the expansion device location for warm temperature.

Is the liquid line extremely cold at the expansion device location and warm after the expansion device location?

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Go to Step 11

Go to Step 5

Feel along the surfaces of the following low side components:

Did you feel an abrupt temperature change along the surfaces of any of the listed components?

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Go to Step 7

Go to Step 6

Feel along the surfaces of low and high side components:

Are the temperatures of these components only mildly warm?

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Go to Step 14

Go to Step 8

1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .
2. Remove the restriction from the component, or replace the component which produced an abrupt temperature drop.

Is the repair complete?

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Go to Step 9

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1. Recover the refrigerant and evacuate the system. Refer to Refrigerant Recovery and Recharging .
2. Record the weight of the recovered refrigerant.

Is the weight of the recovered refrigerant charge equal to or above the specified value?

0.75 kg (1.50 lb)

Go to Step 9

Go to Step 10

Recharge the A/C system. Refer to Refrigerant Recovery and Recharging .

Is the cooling performance improved?

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Go to Step 21

Go to Step 10

1. Leak test the system. Refer to Leak Testing .
2. Repair any leaks.

Is the repair complete?

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Go to Step 21

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1. The expansion device is restricted.
2. Replace the expansion device. Refer to Expansion (Orifice) Tube Replacement .

Are there metal flakes present?

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Go to Step 12

Go to Step 13

1. Remove the suction line, or remove the compressor hose assembly from the vehicle. Refer to Suction Hose Replacement , or to Compressor Hose Assembly Replacement .
2. Inspect the hose/line for debris by blowing shop air through one end of the hose while covering the other end with a shop towel.
3. Note the amount of debris collected in the shop towel.

Did a large amount of debris collect in the shop towel?

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Go to Step 18

Go to Step 20

If the expansion device was restricted with a brown or black residue, perform the following procedure:

1. Flush the A/C system. Refer to the J 43600 Operation Manual.
2. Replace the accumulator. Refer to Air Conditioning Accumulator Replacement .

Are the repairs complete?

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Go to Step 21

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1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .
2. Disconnect the suction and the discharge lines, or disconnect the compressor hose from the compressor. Refer to the following procedures:

•	Suction Hose Replacement

•	Discharge Hose Replacement

•	Compressor Hose Assembly Replacement

Is debris present in the compressor suction port?

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Go to Step 15

Go to Step 19

1. Remove the debris from the suction port.
2. Inspect the expansion device for damage or debris. Refer to Expansion (Orifice) Tube Replacement .

Did you find evidence of damage or debris?

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Go to Step 17

Go to Step 16

If the expansion device does not show any signs of damage or debris, perform the following procedure:

1. Remove the suction line, or remove the compressor hose assembly from the vehicle. Refer to Suction Hose Replacement , or to Compressor Hose Assembly Replacement .
2. Inspect the hose/line for debris by blowing shop air through one end of the hose while covering the other end with a shop towel.
3. Note the amount of debris collected in the shop towel.

Did a large amount of debris collect in the shop towel?

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Go to Step 18

Go to Step 19

1. Replace the expansion device. Refer to Expansion (Orifice) Tube Replacement .
2. If the expansion device was restricted, note the type of debris present.

Are there metal flakes present?

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Go to Step 12

Go to Step 13

If there was a large amount of debris collected in the shop towel from the compressor hose assembly, perform the following procedure:

1. Replace the accumulator. Refer to Air Conditioning Accumulator Replacement .
2. Install an A/C refrigerant filter. Refer to Air Conditioning Evaporator Thermal Expansion Valve Screen Replacement .

Are the repairs complete?

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Go to Step 19

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Install the suction and discharge lines, or install the compressor hose assembly. Refer to the following procedures:

Are the repairs complete?

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Go to Step 21

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1. Install the suction and discharge lines, or install the compressor hose assembly. Refer to the following procedures:

•	Suction Hose Replacement

•	Discharge Hose Replacement

•	Compressor Hose Assembly Replacement

2. Install an A/C refrigerant filter. Refer to Air Conditioning Evaporator Thermal Expansion Valve Screen Replacement .
3. Recharge the A/C system. Refer to Refrigerant Recovery and Recharging .

Are the repairs complete?

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Go to Step 21

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

Are the readings within the specified ranges as shown on the A/C Performance Chart?

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Go to Step 22

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

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Symptoms - HVAC Systems - Manual , or to Symptoms - HVAC Systems - Automatic