DEFINITION: The low and the high side pressures are both higher than normal.

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

Go to Step 2

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

1. Start the engine.
2. Make sure that the A/C is ON.
3. Inspect for proper cooling fan operation. Refer to Cooling System Description and Operation in Engine Cooling.

Are the cooling fans ON and operating properly?

Go to Step 3

Go to Step 5

Visually inspect for the following conditions:

Do any of these conditions exist?

Go to Step 4

Go to Step 6

Repair the air flow restriction.

Is the repair complete?

Go to Step 7

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Repair the fault to the cooling fan operation. Refer to Cooling Fan Inoperative in Engine Cooling.

Is the repair complete?

Go to Step 7

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Air is in the refrigerant system, or the system is overcharged. Refer to the view screen on J 43600 ACR 2000 Air Conditioning Service Center for foreign gas content in the refrigerant.

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

Is the repair complete?

Go to Step 7

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1. Record the low and high side pressures and the I/P panel outlet air temperature after you have performed the repairs.
2. Compare the pressures and the panel 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 listed in the A/C Performance table?

Go to Step 8

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 in HVAC Systems - Automatic