Suzuki XL7 2007 Service Manual page 1863

Noise Diagnosis - Air Conditioning (A/C) System
Step
DEFINITION: Noise originating from the A/C compressor, drive belt or the A/C lines.
Were you sent here from Symptoms or another diagnostic
1 table?
A/C system noises can be generally categorized into 3 areas:
• Screeching, Squealing, Chirping noises
• Moaning noises
• Vibration/Rattle noises
2
1. Start the engine.
2. Ensure that the A/C is ON.
Is a screeching, squealing noise heard when the A/C is
engaged?
With the engine OFF, inspect the drive belt for excessive wear.
3 Refer to "Drive Belt Falls Off and Excessive Wear Diagnosis: ".
Is the drive belt excessively worn?
Inspect the drive belt tension. Refer to "Drive Belt Tensioner
4 Diagnosis: ".
Is the drive belt tension correct?
Inspect the drive belt for excessive oil coverage.
5
Is the drive belt covered with oil?
1. Start the engine.
2. Ensure that the A/C is ON.
6
3. Inspect the compressor and the clutch.
Is the A/C compressor locked up?
7 Is the A/C compressor clutch slipping?
WARNING
!
Refer to "Moving Parts and Hot Surfaces Caution:
".
8
Using a stethoscope, listen to the A/C compressor for any
abnormal noises.
Is the compressor causing an abnormal noise?
9 Does a moaning noise exist when the A/C clutch is engaged?
Listen to the A/C compressor components and mounting for
noise concerns using a stethoscope.
10
Are any of these components loose, damaged or excessively
worn?
1. Idle the engine.
2. Engage the A/C compressor clutch.
3. Using a stethoscope, move around the entire refrigerant
plumbing system. Listening for any abnormal noises
11
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?
Does a vibration or rattle noise exist when the A/C clutch is
12
engaged?
13 Does the noise stop when the A/C clutch is disengaged?
1. Idle the engine in PARK with the A/C compressor clutch
engaged.
14
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?
Action
Heating, Ventilation and Air Conditioning:
Yes
Go to Step 2
Go to Step 3
Go to Step 18
Go to Step 5
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Go to Step 24
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Go to Step 15
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Go to Step 13
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Go to Step 21
7A-49
No
Go to "Symptoms -
HVAC Systems -
Automatic"
Go to Step 9
Go to Step 4
Go to Step 19
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Go to Step 8
Go to Step 10
Go to Step 12
Go to Step 11
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