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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 113 (Automatic Transmission Servicing (4L60-E)) >> Lubrication >> Checking Fluid Level & Condition >> Checking Fluid Condition

Checking Fluid Condition

WARNING: This page is about a different car, the 2003 GMC Savana and 2003 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check the fluid color. Is the fluid Red in color? If so, go to step  5 . If not, go to next step.
  2. Is the fluid a non-transparent Pink in color? If so, go to step  14 . If not, go to next step.
    NOTE: Fluid may turn a Dark Brown in color from normal use. This does not always indicate an oxidation or a contamination issue.
  3. Is the fluid a Light Brown in color? If so, go to step  5 . If not, go to next step.
  4. Is the fluid Black in color and or have a burnt smell? If so, go to step  14 . If not, go to next step.
  5. Does the fluid appear as a solid liquid and not foamy or full of bubbles on level indicator? If so, go to next step. If not, go to step  7 .
  6. Check the fluid level. Proper level should be in middle of the "X" pattern, on level indicator. Is the level okay? If so, go to step  19 . If not, go to next step.
  7. Is the fluid level high on indicator? If so, go to step  12 . If not, go to next step.
  8. Is the fluid level low on indicator? If so, go to next step. If not, go to step  4 .
  9. Check for any external leak or leaks. Did you find an external leak or leaks? If so, go to next step. If not, go to step  11 .
  10. Correct leak or leaks as needed. Are any leak or leaks still present? If so, go to step  9 . If not, go to next step.
  11. Add fluid until level is in middle of "X" pattern on the level indicator. Is the level okay? If so, go to step  19 . If not, go to step  6 .
  12. Drain fluid until level is in middle of "X" pattern on the level indicator. Is level okay? If so, go to step  19 . If not, go to step  6 .
  13. Replace oil cooler and flush lines. See AUXILIARY OIL COOLER  under REMOVAL & INSTALLATION. Is the replacement complete? If so, go to step  15 .
    NOTE: A small amount of friction material in pan bottom is a normal condition, but large pieces and or metal particles will require complete transmission overhaul.
  14. Drain fluid and remove oil pan to inspect. Is there sign or signs of internal component damage noted in bottom of transmission oil pan? If so, go to step  16 . If not go to step  13 .
  15. Replace the filter and fluid. See DRAINING & REFILLING  . Is the replacement complete? If so, go to step  6 .
  16. Flush oil cooler and lines and check flow. See OIL COOLER FLUSHING & FLOW CHECK  . Is the oil cooler flushing and flow test complete? If so, go to step  17 .
  17. Overhaul transmission. See appropriate OVERHAUL article. Is the overhaul procedure complete? If so, go to next step.
  18. Add new fluid. Is the procedure complete? If so, go to step  6 .
  19. Check the fluid level and correct as necessary. Is the fluid level satisfactory? If so, system is okay. If not, go to step  1 .
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