GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 Savana 🢒 Engine 🢒 Engine Mechanical - 5.0L and 5.7L 🢒 Drive Belt Rumbling Diagnosis

Step

Action

Yes

No

DEFINITION:

    • A low pitch tapping noise caused by drive belt misalignment. This noise occurs on cold start-up at idle.
    • A low frequency noise heard once per revolution of the drive belt.

1

Check for severe pilling.

Is there severe pilling of more than 1/3 of the rib depth?

Go to Step 2

System OK

2

Clean the drive belt pulleys.

Is the repair complete?

System OK

Go to Step 3

3

Install a new drive belt. Refer to Drive Belt Replacement .

Is the repair complete?

System OK

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