Noise Diagnosis - A/C System - GMC chevrolet camaro 2000 Service Manual

1-24 Heating, Ventilation and Air Conditioning HVAC
Noise Diagnosis - A/C System
Step Action Value(s) Yes No
Were you sent here from A Diagnostic System Check? Go to
A
Diagnostic
1
-
System Check in
HV AC Systems -
Go to Step2 Manual
1. Sit inside the vehicle.
2. Close the vehicle doors and windows.
3. Turn the ignition switch to the ON position;
engine OFF.
4. Turn the blower switch to position 5 (high).
2 -
5. Set the temperature con.trol to the full cold position.
6. Set the mode control to the UPPER (1/P outlets).
7. Depress the air conditioning (A/C) button to the OFF
Go to Noise
position.
Diagnosis -
Is an abnormal noise present? Blower Motor Go to Step 3
.
1. Start the engine and allow the engine to idle Go to HVAC
in PARK. Compressor
3
2. Depress the A/C button to the ON position. -
Clutch Does_ Not
Is the A/C clutch engaged and supplying cold air to the
Engage in HV AC
Systems -
passenger compartment?
Go to Step 4 Manual
A/C system noises can be generally categorized into
three areas:
• Screech/Squealing noises
4
• Moaning noises
-
• Vibration/Rattle noises
(
Is a screech/squealing noise heard when the A/C clutch is
engaged? Go to Step 5 Go to Step 14
Inspect the A/C compressor drive belt for excessive wear
5
or oil coverage.
-
Is the drive belt excessively worn or covered with oil? Go to Step 6 Go to. Step 7
1. Repair the source of the oil leak, if a leak was
!
present.
Refer to Oil Leak Diagnosis in Engine Mechanical.
6
2.
Replace the A/C compressor drive belt.
-
-
Refer to Drive Belt Replacement in Engine
Mechanical - 3.8 L or Drive Belt Replacement - A!C in
Engine Mechanical - 5. 7 L.
Is the repair complete? Go to Step 30
1. Start the engine and allow the engine to idle
in PARK.
2. Engage the A/C compressor clutch.
7
3. Using a stethoscope, check the A/C compressor drive
-
belt idler pulley for any abnormal noises.
Is the idler pulley-operating normally without
abnormal noise?
Go to Step 9 Go to Step 8
Replace the A/C compressor drive belt idler pulley. Refer
to Drive Belt Idler Pulley Replacement in Engine
8
Mechanical - 3.8 L or Drive Belt Idler Pulley Replacement -
-
-
A!C in Engine Mechanical - 5.7 L.
Is the repair complete?
Go to Step 30