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Home >> Chevrolet >> 2012 >> Cruze Eco, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 79 (Heating, Ventilation, And Air Conditioning) >> Diagnostic Information and Procedures >> Air Conditioning (A/C) Diagnostics - Pressure Zone C

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

WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
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 (LNF) 
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 .
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 (2.2L) or Cooling Fan Inoperative (2.0L) .
Is the repair complete?		 Go to Step 9  -
6
WARNING: Refer to Moving Parts and Hot Surfaces Warning .
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 Air Conditioning Evaporator 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 the J 43600  ACR 2000 Air Conditioning Service Center for foreign gas content in the refrigerant. See Special Tools .
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 instrument panel (I/P) 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 (LNF) .
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 (LNF) 
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
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