A transmission fluid pump is a hand-pumped vacuum that removes the fluid from the transmission. Using a fluid pump is a often a preferred method because it doesn't require dropping the transmission drain pan, which often drenches the mechanic in oil. The fluid pump draws fluid from the top of the engine cavity instead of having to slide underneath the vehicle. This method saves time, energy and the cost of an auto repair shop.
Park the car on a level surface, and wait about 30 minutes until the engine cools. A hot engine can result in heat damage to the skin.
Pop the hood, and locate the transmission dipstick---usually a yellow, red or black ring located between the battery and the air intake, although its appearance can vary depending on the make and model of the vehicle. Check the owner's manual for the exact location.
Remove the dipstick, and place the end of the plastic tube into the transmission tube. Feed it down the tube until it touches the bottom of the transmission drain pan.
Close the plastic latch on the air pump's tubing. Pump the plunger 30 to 50 times. Open the plastic latch, and wait for the vacuum tank to suck up all the fluid. Remove the plastic tube from the transmission.
Place a funnel into the transmission tube. Read the amount of liquid sucked out of the tank on the side of the vacuum tank. Pour this amount of transmission fluid into the funnel. Replace the dipstick, and close the engine hood.
