GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2006 🢒 Uplander 🢒 Engine 🢒 Engine Controls - 3.9L 🢒 Drive Belt Chirping Diagnosis

Step

Action

Yes

No

DEFINITION: The following items are indications of chirping:

    • A high pitched noise that is heard once per revolution of the drive belt or a pulley.
    • It usually occurs on cold damp mornings.
    • Verify the condition by spraying water on the belt. The noise should stop momentarily.

1

Check for misalignment of the pulleys.

Are any of the pulleys misaligned?

Go to Step 2

Go to Step 3

2

Replace any misaligned pulleys.

Is the chirp still present?

Go to Step 3

System OK

3

Check for bent or cracked brackets.

Are there any bent or cracked brackets?

Go to Step 4

Go to Step 5

4

Replace any bent or cracked brackets.

Is the chirp still present?

Go to Step 5

System OK

5

Check for any loose or missing fasteners.

Are there any loose or missing fasteners?

Go to Step 6

Go to Step 7

6
  1. Tighten any loose fasteners.
  2. Replace any missing fasteners. Refer to Fasteners .

Is the chirp still present?

Go to Step 7

System OK

7

Check for a bent pulley flange.

Is there a bent pulley flange?

Go to Step 8

Go to Step 9

8

Replace the pulley.

Is the chirp still present?

Go to Step 9

System OK

9

Check for severe pilling, exceeding 1/3 of the belt groove depth.

Is there severe pilling?

Go to Step 10

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10

Replace the drive belt. Refer to Drive Belt Replacement .

Is the repair complete?

--

System OK