Yukon/Denali 2WD V8-4.8L VIN V (2005)
Drive Belt Squeal Diagnosis
Diagnostic Aids
A loose or improper installation of a body, or suspension component, or other item(s) on the vehicle may cause the squeal noise.
If the squeal is intermittent, verify that it is not the accessory drive component(s) by varying their load(s), 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.
2. The squeal may not be engine related. This step is to verify that the engine is making the noise. If the engine is not making the noise do not
proceed further in this table
3. The squeal may be an internal engine noise. Remove the drive belt(s) and operate the engine for a few seconds, this will verify if the squealing
noise is related to the drive belt(s) or an 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. This test is to verify that an accessory drive component(s) does not have a seized bearing. With the belt(s) removed, test the bearings in the
accessory drive component(s) for smooth operation. Also test the accessory drive component(s) with the engine operating by varying the load on
the accessory drive component(s) to verify that the component(s) is operating properly.
5. This test is to verify that the drive belt(s) tensioner(s) are not operating properly. If the drive belt tensioner(s) are not operating properly, proper
