GM Service Manual Online
For 1990-2009 cars only

Diagnostic Aids

If the clutch engages, but slips while driving the vehicle, inspect the clutch disc to make sure it is properly seated. Also inspect for worn facings on the disc plate, the disc to be covered in fluid, for a worn or damaged clutch cover, and for weak diaphragm springs.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This step inspects the clutch system components and the operation of the clutch system.

  2. This step inspects for the source of the fluid leak.

  3. This step inspects for a worn facing or for being torn from the disc plate.

Step

Action

Yes

No

DEFINITION: The clutch engages but slips while driving the vehicle.

1

Did you review the clutch symptom operations and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Clutch

2

Make 30-40 normal starts. Do not over heat the clutch.

Does the clutch still slip?

Go to Step 3

System OK

3

  1. Remove the transmission. Refer to Transmission Replacement in Manual Transmission - NV 1500 or Transmission Replacement in Manual Transmission - NV 3500.
  2. Inspect the disc plate for being over heated.

Is the clutch disc overheated?

Go to Step 4

Go to Step 5

4

Allow the disc plate to cool.

Does the clutch still slip?

Go to Step 5

System OK

5

Inspect the clutch disc in order to see if the disc is oil soaked.

Is the disc plate oil soaked?

Go to Step 6

Go to Step 7

6

Repair the leak at the source, and replace the clutch disc. Refer to Clutch Assembly Replacement .

Does the clutch still slip?

Go to Step 7

System OK

7

Inspect the clutch disc for a worn facing, or for the facing being torn from the disc plate.

Is the facing worn or torn from the disc plate?

Go to Step 8

Go to Step 9

8

Replace the clutch disc. Refer to Clutch Assembly Replacement .

Does the clutch still slip?

Go to Step 9

System OK

9

Inspect for a weak diaphragm spring.

Is the diaphragm spring weak?

Go to Step 10

System OK

10

Replace the disc plate. Refer to Clutch Assembly Replacement .

Did you find and repair the condition?

Go to Step 11

Go to Diagnostic Aids

11

  1. Install the transmission. Refer to Transmission Replacement in Manual Transmission - NV 1500 or Transmission Replacement in Manual Transmission - NV 3500.
  2. Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 1