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Noise Diagnosis - Air Conditioning (A/C) System (with HP5)

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
Step Action Yes No
DEFINITION: Noise originating from the A/C compressor, or the A/C lines.
1 Were you sent here from Symptoms or another diagnostic table? Go to Step 2  Go to Symptoms - HVAC Systems - Manual or Symptoms - HVAC Systems - Automatic .
2 A/C system noises can be generally categorized into 3 areas:
  • Screeching, squealing, chirping noises
  • Moaning noises
  • Vibration/rattle noises
  1. Start the engine.
  2. Ensure that the A/C is ON.

Is a screeching, squealing noise heard when the A/C is engaged?		 Go to Step 3  Go to Step 9 
3
  1. Start the engine.
  2. Ensure that the A/C is ON.
  3. Inspect the compressor.
Is the A/C compressor locked up?		 Go to Step 16  Go to Step 4 
4
CAUTION: Refer to Moving Parts and Hot Surfaces Warning .
Using a stethoscope, listen to the A/C compressor for any abnormal noises.Is the compressor causing an abnormal noise?		 Go to Step 11  Go to Step 6 
5 Does a moaning noise exist when the A/C compressor is turned on? Go to Step 6  Go to Step 8 
6 Listen to the A/C compressor components and mounting for noise concerns using a stethoscope.
Are any of these components loose, damaged or excessively worn?		 Go to Step 13  Go to Step 7 
7
  1. Idle the engine.
  2. Turn on the A/C compressor.
  3. Using a stethoscope, move around the entire refrigerant plumbing system. Listening for any abnormal noises caused by a component of the A/C system touching another component.
Are any of the A/C components grounding out and causing a vibration noise?		 Go to Step 15  Go to Step 9 
8 Does a vibration or rattle noise exist when the A/C compressor is turned on? Go to Step 9  Go to Step 10 
9 Does the noise stop when the A/C compressor is turned off? Go to Step 11  Go to Step 17 
10
  1. Idle the engine in PARK with the A/C compressor turned on.
  2. Using a stethoscope, move around the entire A/C system testing for any abnormal noises caused by a component.
Do any of the A/C components cause an abnormal noise?		 Go to Step 14  Go to Step 17 
11 Verify that the A/C system is properly charged. Refer to Refrigerant System Capacities (With HP5)  or Refrigerant System Capacities (Without HP5) .
Is the A/C system properly charged?		 Go to Step 18  Go to Step 12 
12 Recharge the A/C system to specification. Refer to Refrigerant Recovery and Recharging (With HP5)  or Refrigerant Recovery and Recharging (Without HP5) .
Is the abnormal compressor noise still present?		 Go to Step 16  Go to Step 18 
13 Repair or replace the A/C compressor mounting component.
Is the repair complete?		 Go to Step 18  -
14 Repair or replace the component which is causing the moaning concern as needed.
Is the repair complete?		 Go to Step 18  -
15 Correctly route or insulate the A/C component.
Is the repair complete?		 Go to Step 18  -
16 Replace the A/C compressor. Refer to Air Conditioning Compressor Replacement (HP5)  or Air Conditioning Compressor Replacement (LY7)  or Air Conditioning Compressor Replacement (LZ4)  or Air Conditioning Compressor Replacement (LAT, LE5) .
Is the repair complete?		 Go to Step 18  -
17 The concern may be caused by an engine related component. Refer to Vibration Analysis - Engine .
Did you find and correct the condition?		 Go to Step 18  -
18 Operate the system in order to verify the repair.
Did you find and correct the condition?		 System OK Go to Step 2 
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