Express 1/2 Ton Van V6-4.3L VIN W (1999)
14. Switch the ignition off.
15. Verify the fluid level.
16. Remove the pump reservoir cap.
17. Attach J 43485 to J 35555 or equivalent.
18. Place J 43485 on or in the pump reservoir filler neck.
19. Apply a vacuum of 68 kPa (20 in Hg) maximum.
20. Wait 5 minutes.
21. Remove the J 43485 and the J 35555.
22. Verify the fluid level.