DEFINITION: The low side pressure is lower than normal and the high side pressure is higher than normal.

Were you sent here from the air conditioning (A/C) System Performance Test?

Go to Step 2

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

Feel the liquid line before the thermal expansion valve (TXV).

Is the liquid line cold before the TXV?

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 along the surfaces of any of the listed components?

Go to Step 7

Go to Step 4

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

Is the liquid line extremely cold at the TXV location and warm beyond the TXV location?

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?

Go to Step 7

Go to Step 6

Feel along the surfaces of the low and the high side components.

Are the temperatures of these components only mildly warm?

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 action complete?

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.
3. Compare the weight of the recovered refrigerant with the system capacity. Refer to Refrigerant System Specifications .

Is the weight of the recovered refrigerant charge greater than 75 percent of the total system capacity?

Go to Step 9

Go to Step 10

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

Is the cooling performance improved?

Go to Step 20

Go to Step 10

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

Is the action complete?

Go to Step 20

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The TXV is restricted.

1. Replace the TXV. Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement .
2. If the TXV was restricted, note the type of debris present.

Are metal flakes present?

Go to Step 12

Go to Step 13

1. Remove the compressor hose assembly from the vehicle. Refer to Air Conditioning Compressor Hose Replacement : Diesel  → L4  → V6 .
2. Inspect the hose for debris by blowing compressed air through one end of the hose while covering the other end with a workshop cloth.
3. Observe the amount of debris collected in the workshop cloth.

Did a large amount of debris collect in the workshop cloth?

Go to Step 18

Go to Step 19

If the TXV was restricted with a brown or black residue, replace the refrigerant desiccant.

Are the actions complete?

Go to Step 20

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1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .
2. Disconnect the compressor hose from the compressor. Refer to Air Conditioning Compressor Hose Replacement : Diesel  → L4  → V6 .
3. Inspect for the presence of debris in the compressor suction port.

Are debris present in the compressor suction port?

Go to Step 15

Go to Step 19

1. Remove the debris from the suction port.
2. Inspect the TXV for damage or debris. Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement .

Did you find evidence of damage or debris?

Go to Step 17

Go to Step 16

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

1. Remove the compressor hose assembly from the vehicle. Refer to Air Conditioning Compressor Hose Replacement : Diesel  → L4  → V6 .
2. Inspect the hose for debris by blowing compressed air through one end of the hose while covering the other end with a workshop cloth.
3. Observe the amount of debris collected in the workshop cloth.

Did a large amount of debris collect in the workshop cloth?

Go to Step 18

Go to Step 19

1. Replace the TXV. Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement .
2. If the TXV was restricted, observe the type of debris present.

Are metal flakes present?

Go to Step 12

Go to Step 13

If a large amount of debris was collected in the workshop cloth from the compressor hose assembly, replace the refrigerant desiccant.

Is the action complete?

Go to Step 19

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1. Install the compressor hose assembly. Refer to Air Conditioning Compressor Hose Replacement : Diesel  → L4  → V6 .
2. Recharge the A/C system. Refer to Refrigerant Recovery and Recharging .

Are the actions complete?

Go to Step 20

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1. Record the low and the high side pressures and the instrument panel outlet air temperature after you perform the repairs.
2. Compare the pressures and the instrument panel outlet air 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?

Go to Step 21

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

Operate the system in order to verify the repair.

Did you find and correct the condition?

System OK

Go to Symptoms - HVAC Systems - Automatic .