K 1500 Suburban 4WD V8-5.3L VIN Z Flex Fuel (2003)
water pump with a known, good water pump.
10. Accessory drive component brackets that are bent, cracked, or loose may put an extra strain on that accessory drive component causing it to
vibrate.
Drive Belt Whine
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.
Drive Belt Whine Diagnosis
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 overate the engine for a few
seconds, 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. This 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.
