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

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
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. Start the engine.
  2. Turn ON the A/C.
  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 
3 Visually inspect for the following conditions:
  • Damaged condenser cooling fins
  • Missing or misaligned air baffles
  • Restricted air flow

Do any of these 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 fault to the cooling fan operation. Refer to Cooling Fan Inoperative 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.Are the temperatures on both sides of the expansion device similar?		 Go to Step 7  Go to Step 8 
7 Replace the damaged or faulty thermal expansion valve. Refer to Thermal Expansion Valve Replacement .
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 J 43600  ACR 2000 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 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 Chart?		 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 or Symptoms - HVAC Systems - Automatic
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