GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

DEFINITION: The vibration is engine-speed related. The vibration may be sensitive to accessory load. Refer to Diagnostic Information and Procedures in Vibration Diagnosis and Correction.

1

Check the drive belt for wear, damage, debris build-up and missing drive belt ribs.

Is the drive belt worn or damaged?

Go to Step 2

Go to Step 3

2

Replace as necessary. Refer to Drive Belt Replacement .

Is the repair complete?

System OK

Go to Step 3

3

Check for loose or missing fasteners.

Are there loose or missing fasteners?

Go to Step 4

Go to Step 5

4

Re-tighten or replace as necessary.

Is the repair complete?

System OK

--

5

Check for damaged fan blades or bent fan clutch shaft.

Are there damaged fan blades or a bent fan clutch shaft?

Go to Step 6

Go to Step 7

6

Replace as necessary. Refer to Fan Clutch Replacement in Engine Cooling.

Is the replacement complete?

System OK

--

7

Check for a bent water pump shaft.

Is the water pump shaft bent?

Go to Step 8

Go to Step 9

8

Replace as necessary.

Refer to Water Pump Replacement in Engine Cooling.

Is the repair complete?

System OK

--

9

Check for bent or cracked brackets.

Are there bent or cracked brackets?

Go to Step 10

System OK

10

Replace the brackets as necessary.

Is the repair complete?

System OK

--