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Air Conditioning (A/C) Diagnostics - Pressure Zone C

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Air Conditioning (A/C) Diagnostics - Pressure Zone C

Step Action Yes No
DEFINITION: The low and the high side pressures are both higher than normal.
  • Restricted Condenser Air Flow
  • Cooling Fan Malfunction
  • Expansion Device Malfunction
1 Were you sent here from the A/C System Performance Test? Go to Step 2  Go to Air Conditioning (A/C) System Performance Test 
2
  1. With the engine idling, turn ON the A/C.
  2. 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 
3 Visually inspect for the following:
  • Restricted air flow
  • Damaged condenser cooling fins
  • Inspect for missing or misaligned air baffles.

Do the following conditions exist?		 Go to Step 4  Go to Step 6 
4 Repair the air flow restriction.
Is the repair complete?		 Go to Step 9  -
5 Repair the cooling fan operation fault. Refer to Diagnostic System Check - Engine Cooling in Engine Cooling.
Is the repair complete?		 Go to Step 9  -
6
CAUTION: Refer to Moving Parts and Hot Surfaces Caution in Cautions and Notices.
Feel the liquid line on both sides of the expansion device.Is the temperature the same before and after the expansion device?		 Go to Step 7  Go to Step 8 
7 Replace the damaged/faulty orifice tube. Refer to Expansion (Orifice) Tube Replacement (Front Only System)  or Expansion (Orifice) Tube Replacement (Auxiliary System) .
Is the repair complete?		 Go to Step 9  -
8 Air is in the refrigerant system, or the system is overcharged. Refer to the view screen on the J 43600  for foreign gas content in the refrigerant. See Special Tools and Equipment .
Recover and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
Is the repair complete?		 Go to Step 9  -
9
  1. Record the low and high side pressures and the I/P 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 10  Go to Air Conditioning (A/C) System Performance Test 
10 Operate the system in order to verify the repair.
Did you find and correct the condition?		 System OK Go to Symptoms - HVAC Systems - Manual in HVAC - Manual
OR
Symptoms - HVAC Systems - Automatic in HVAC - Automatic
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