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

WARNING: This page is about a different car, the 2004 Pontiac Sunfire and 2004 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
Air Conditioning (A/C) Diagnostics - Pressure Zone B

Step Action Yes No
DEFINITION: The low side pressure is higher than normal and the high side pressure is lower than normal.
  • Malfunctioning A/C Compressor
  • Refrigerant Under Charge
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 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 
3
  1. Refer to the pressures recorded during the A/C System Performance Test.
  2. Inspect for the following conditions:
Do the listed conditions exist?		 Go to Step 5  Go to Step 4 
4
  1. Refer to the pressures recorded during the A/C System Performance Test.
  2. Inspect for the following conditions:
Do the listed conditions exist ?		 Go to Step 5  Go to Air Conditioning (A/C) System Performance Test 
5 The A/C system has a low refrigerant charge. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
Is the action complete?		 Go to Step 6  -
6
  1. After you perform the repairs, record the following:
    • The low and high side pressures
    • The instrument panel outlet air temperature
  2. Compare the pressures and the 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 found on the A/C Performance Chart?		 Go to Step 13  Go to Step 7 
7 The A/C compressor is malfunctioning. Remove the expansion device and inspect for contamination. Refer to Expansion (Orifice) Tube Replacement .
Did you find metal flakes on the expansion device?		 Go to Step 9  Go to Step 8 
8 Inspect the expansion device for a brown, powdery residue indicating desiccant in the A/C system.
Is a brown, powdery residue present?		 Go to Step 11  Go to Step 12 
9
  1. Remove the compressor hose from the compressor. Refer to Compressor Hose Assembly Replacement (L61) .
  2. Inspect for metal flake contamination at the line connections and at the compressor ports.
Is metal flake contamination present?		 Go to Step 10  Go to Step 12 
10
  1. Replace the A/C compressor. Refer to Compressor Replacement .
  2. Install an A/C refrigerant filter. Refer to Air Conditioning (A/C) Refrigerant Filter Installation .
  3. Replace the orifice tube. Refer to Expansion (Orifice) Tube Replacement .
  4. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
Is the action complete?		 Go to Step 13  -
11
  1. Flush the A/C system. Refer to Flushing .
  2. Replace the orifice tube. Refer to Expansion (Orifice) Tube Replacement .
  3. Replace the A/C compressor. Refer to Compressor Replacement .
  4. Replace the accumulator. Refer to Accumulator Replacement (L61) .
  5. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
Is the action complete?		 Go to Step 13  -
12
  1. Replace the A/C compressor. Refer to Compressor Replacement .
  2. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
Is the action complete?		 Go to Step 13  -
13 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 Systems - Manual
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