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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 155 (Automatic Transmission - 6L50/6L80/6L90 - Service, Diagnosis & Troubleshooting) >> Transmission Fluid Checking >> Hot Check Procedure

Hot Check Procedure

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    IMPORTANT: Us this procedure to check the transmission fluid level when the TFT is between 160°F and 200°F (71°C and 93°C). The hot check procedure is the most accurate method to check the fluid level. The hot check should be performed at the first opportunity in order to verify the cold check. The fluid level rises as fluid temperature increases, so it is important to ensure the transmission temperature is within range.
  1. Locate the transmission dipstick at the rear of the engine compartment, on the passenger's side of the vehicle.
  2. Flip the handle up, and then pull out the dipstick and wipe it with a clean rag or paper towel.
  3. Install the dipstick by pushing it back in all the way, wait three seconds and then pull it back out again.
    4. IMPORTANT: Always check the fluid level at least twice. Consistent readings are important to maintaining proper fluid level. If inconsistent readings are noted, inspect the transmission vent assembly to ensure it is clean and unclogged.
  4. Check both sides of the dipstick, and read the lower level. Repeat the check procedure to verify the reading.
  5. Inspect the color of the fluid on the dipstick. Refer to Fluid Condition Inspection .
  6. A safe operating fluid level is within the HOT crosshatch band on the dipstick. If the fluid level is not within the HOT band, and the TFT is between 160°F and 200°F (71°C and 93°C), add or drain fluid as necessary to bring the level into the HOT band. If the fluid level is low, add only enough fluid to bring the level into the HOT band. It does not take much fluid, generally less than one pint (0.5L). Do not overfill. Also, if the fluid level is low, inspect the transmission for leaks. Refer to Fluid Leak Diagnosis .
  7. If the fluid level is in the acceptable range, push the dipstick back in all the way, then flip the handle down to lock the dipstick in place.
  8. If applicable and if the vehicle is equipped, reset the transmission oil life monitor only if the fluid was changed.
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