GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC K Pickup - 4WD 🢒 Engine 🢒 Engine Mechanical - 5.0L and 5.7L 🢒 Drive Belt Squeal Diagnosis

Step

Action

Yes

No

DEFINITION: The following items are indications of squeal:

    • A loud screeching noise that is caused by a slipping drive belt (this is unusual for a drive belt with multiple ribs)
    • The noise occurs when a heavy load is applied to the drive belt, such as an air conditioning compressor engagement snapping the throttle, or slipping on a seized pulley.

1

Check for a misaligned pulley.

Is there a pulley misaligned?

Go to Step 3

Go to Step 2

2

Check for correct drive belt length. Refer to Drive Belt Replacement .

Is the drive belt the correct length?

Go to Step 4

Go to Step 5

3

Repair or install new parts as necessary.

Is the repair complete?

System OK

--

4

Check the drive belt tensioner for proper operation. Refer to Drive Belt Tensioner Replacement .

Is the drive belt tensioner operating correctly?

Go to Step 3

Go to Step 5

5

Check for correct pulley size.

Are the pulleys the correct size?

Go to Step 6

Go to Step 3

6

Check for seized bearings.

Is there a seized bearing?

Go to Step 3

System OK