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

Go to Step 2

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

After continued operation of the A/C system, do the low and high side pressures equalize or become static?

Go to Step 5

Go to Step 3

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 5

Go to Step 4

Refer to the pressures recorded during the A/C System Performance Test.

Inspect for the following conditions:

Do the listed conditions exist ?

Go to Step 5

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

The A/C system has a low refrigerant charge.

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

Is the procedure complete?

Go to Step 6

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1. Record the low and high side pressures as well as the IP outlet air temperature after repairs are performed.
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?

Go to Step 13

Go to Step 7

The A/C compressor is malfunctioning.

Remove the expansion device and inspect for contamination. Refer to Thermal Expansion Valve Replacement .

Are there metal flakes on the expansion device?

Go to Step 9

Go to Step 8

Inspect the expansion device for a brown, powdery residue indicating desiccant in the A/C system.

Is there a brown, powdery residue present?

Go to Step 11

Go to Step 12

1. Remove the suction and discharge lines from the compressor. Refer to Suction Hose Replacement and Discharge Hose Replacement .
2. Inspect for metal flake contamination at the line connections and the compressor ports.

Is there metal flake contamination present?

Go to Step 10

Go to Step 10

1. Replace the A/C compressor. Refer to Air Conditioning Compressor Replacement .
2. Install an A/C refrigerant filter. Refer to Air Conditioning Evaporator Thermal Expansion Valve Screen Replacement .
3. Replace the thermal expansion valve. Refer to Thermal Expansion Valve Replacement .
4. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .

Is the repair complete?

Go to Step 13

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1. Flush the A/C system. Refer to the J 43600 Operation Manual.
2. Replace the thermal expansion valve. Refer to Thermal Expansion Valve Replacement .
3. Replace the A/C compressor. Refer to Air Conditioning Compressor Replacement .
4. Replace the receiver dehydrator. Refer to Receiver Dehydrator Replacement .
5. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .

Is the repair complete?

Go to Step 13

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1. Replace the A/C compressor. Refer to Air Conditioning Compressor Replacement .
2. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .

Is the repair complete?

Go to Step 13

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Operate the system in order to verify the repair

Did you correct the condition?

System OK

Go to Symptoms - HVAC Systems - Manual