2010 GMC Sierra 1500 Crew Cab Owner's Manual - Page 490

Hot Check Procedure Use this procedure to check the transmission fluid level when the transmission fluid temperature is between 71°C and 93°C (160°F and 200°F). The hot check 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. 5. If the fluid level is below the COLD check band, add only enough fluid as necessary to bring the level into the COLD band. It does not take much fluid, generally less than 0.5 Liter (1 Pint). Do not overfill. 6. Perform a hot check at the first opportunity after the transmission reaches a normal operating temperature between 71°C to 93°C (160°F to 200°F). 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. 1. Locate the transmission dipstick at the rear of the engine compartment, on the passenger side of the vehicle. See Engine Compartment Overview on page 6‑16 for more information. 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. Check both sides of the dipstick and read the lower level. Repeat the check procedure to verify the reading. 6-30