Excessive Vacuum Drop Diagnosis
WARNING: This page is about a different car, the 2002 GMC Safari and 2002 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.
- If the vacuum continues to drop, remove the pressure and return hose from the pump.
- Install the plugs (1,2) supplied with the J 43485 into the pressure and return port.
- Attach the J 43485 to the J 35555 or equivalent.
- Place the J 43485 on or in the pump reservoir filler neck.
- Apply a vacuum of 68 kPa (20 in Hg) maximum.
- If the vacuum drops again, repair or replace the pump. If the vacuum holds steady, continue to check the other parts of the steering system.
Important: Fluid must be free from bubbles and foam. Be aware of periodic bubbles that indicate a loose connection or leaking O-ring seal in the return hose or the pressure hose.
Fluid must be free from discoloration.
- Observe the fluid.
- If condition persists, replace the following parts:
- The return hose clamps
- The return hose O-rings
- The pressure hose O-rings
- The gear cylinder line O-rings
- The reservoir to pump O-ring
- Repeat the bleed procedure from the beginning.
- Drive the vehicle approximately 16 km (10 mi) in order to warm the system to operating temperature. Evaluate vehicle on a smooth flat surface.
- Verify the following conditions:
- There is smooth power assist.
- The vehicle operates quietly.
- The pump maintains the proper fluid level.
- There is not any leaking in the steering system.