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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (Heating, Ventilation, And Air Conditioning) >> Diagnostic Information and Procedures >> Noise Diagnosis - Air Conditioning (A/C) System

Noise Diagnosis - Air Conditioning (A/C) System

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
Step Action Yes No
1 Were you sent here from Symptoms? No Go to Step 2  Yes Go to
Symptoms - HVAC Systems - Automatic
2
  1. A/C system noises can be generally categorized into 3 areas:
    • Screeching, squealing, chirping noises
    • Moaning noises
    • Vibration/rattle noises
  2. Start the engine.
  3. Ensure that the A/C is ON.
Is a screeching, squealing noise heard when the A/C is ON?		 Go to Step 3  Go to Step 6 
3 With the engine OFF, inspect the drive belt for excessive wear.
Is the drive belt excessively worn?		 Go to Step 14  Go to Step 4 
4 Inspect the drive belt tension. Drive Belt Chirping, Squeal, and Whine Diagnosis
Is the drive belt tension correct?		 Go to Step 15  Go to Step 5 
5 Inspect the drive belt for excessive oil coverage.
Is the drive belt covered with oil?		 Go to Step 13  Go to Step 6 
6
  1. Start the engine.
  2. Ensure that the A/C is ON.
Is the compressor locked up?		 Go to Step 19  Go to Step 7 
7 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 8 
8 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 16  Go to Step 9 
9
  1. Idle the engine.
  2. Engage the A/C.
  3. Using a stethoscope, move around the entire refrigerant plumbing system, inspecting for any abnormal noises caused by component ground-out.
Are any of the A/C components grounding out and causing a noise?		 Go to Step 21  Go to Step 10 
10
  1. 1. Idle the engine in PARK with the A/C on.
  2. 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 17  Go to Step 20 
11 Verify that the A/C system is properly charged. Approximate Fluid Capacities 
Is the A/C system properly charged?		 Go to Step 19  Go to Step 16 
12 Recharge the A/C system to specification. Refrigerant Recovery and Recharging (R-1234yf) 
Is the abnormal compressor noise still present?		 Go to Step 20  Go to Step 21 
13 Repair the oil leak. the appropriate repair procedure in Engine Mechanical.
Is the repair complete?		 Go to Step 21  -
14 Replace the drive belt. Drive Belt Replacement
Is the replacement complete?		 Go to Step 21  -
15 Replace the drive belt tensioner. Drive Belt Tensioner Replacement
Is the replacement complete?		 Go to Step 21  -
16 Repair or replace the A/C compressor mounting component.
Is the repair complete?		 Go to Step 21  -
17 Repair or replace the component which is causing the moaning concern as needed.
Is the repair complete?		 Go to Step 21  -
18 Correctly route or insulate the A/C component.
Is the repair complete?		 Go to Step 21  -
19 Replace the A/C compressor. Air Conditioning Compressor Replacement (LFV) , or Air Conditioning Compressor Replacement (LTG) 
Is the replacement complete?		 Go to Step 21  -
20 The concern may be caused by an engine related component. Vibration Analysis - Engine
Did you find and correct the condition?		 Go to Step 21  -
21 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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