C Yukon 2WD V8-5.7L VIN R (1999)
23. Reinstall the pump reservoir cap.
EXCESSIVE VACUUM DROP DIAGNOSIS
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Tools Required
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J 35555 Mity Vac
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J 43485 Power Steering Bleed Adapter
1. If the vacuum continues to drop, remove the pressure and return hose from the pump.
2. Install the plugs (1) (2) supplied with J 43485 into the pressure and return port.
3. Attach J 43485 to J 35555 or equivalent.
4. Place J 43485 on or in the pump reservoir filler neck.
5. Apply a vacuum of 68 kPa (20 in-Hg) maximum.
6. 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.
