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DRIVE BELT WHINE DIAGNOSIS
Diagnostic Aids
The drive belt(s) will not cause the whine.
If the whine is intermittent, verify that it is not the accessory drive component(s) by varying their loads, making
sure they are operating to their maximum capacity. An overcharged air conditioning (A/C) system, a power
steering system restriction, or the incorrect fluid, or a failing generator are suggested items to inspect.
Test Description
The number(s) below refer to the step(s) in the diagnostic table.
3:
This test is to verify that the whine is being caused by the accessory drive component(s). Remove the
drive belt(s) and operate the engine for a few second, this will verify if the whining noise is related to the
accessory drive component. With the drive belt(s) removed the water pump will not operate and the
engine may overheat. Also diagnostic trouble codes (DTCs) may set when the engine is operated with the
drive belt(s) removed.
4:
The inspection should include checking the drive belt tensioner and the drive belt idler pulley bearings.
The drive belt(s) may have to be installed and the accessory drive components operated separately by
varying their loads. Refer to the suspected accessory drive component for the proper removal and
installation procedure.
Drive Belt Whine Diagnosis
Did you find and correct the condition?
Go to
Step 9
Go to
Step 6
6
Check for the correct length drive belt.
Did you find and correct the condition?
Go to
Step 9
Go to
Step 7
7
Inspect for misaligned pulley.
Did you find and correct the condition?
Go to
Step 9
Go to
Step 8
8
Inspect for an incorrect size pulley.
Did you find and correct the condition?
Go to
Step 9
-
9
1. Install the drive belt(s). Refer to
Drive Belt Replacement -
Accessory
or
Drive Belt
Replacement - Air
Conditioning
.
2. Clear any codes.
3. Run the engine in order to verify
the repair.
Does the squealing noise still exist?
-
System OK
Step
Action
Yes
No
2004 Chevrolet Corvette
2004 ENGINE PERFORMANCE Engine Mechanical (Introduction) - 5.7L - Corvette
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December-24-07 10:50:09 AM
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