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The automatic transmission has a storied past starting in the 1930s, when most automakers began rushing to develop a working automatic transmission. The first automatic transmissions were only partially automatic, as the driver had to select low or high range, but the transmission automatically shifted between the two gears in each range. In 1939, Oldsmobile released the first fully automatic transmission, the Hydra-Matic. Just as with the engine on a vehicle, the transmission needs cooling, which the vehicles cooling system performs.

Creation of Heat

As with all mechanical components on your vehicle, the automatic transmission creates heat as it works. This heat requires regulation, as excessive heat can cause component failure, resulting in breakdown.

Regulation of Heat

The cooling system, which includes the radiator, thermostat, coolant, water pump and radiator hoses, helps regulate the automatic transmission. The transmission does not have coolant running through it; rather the transmission fluid runs through the radiator to cool it off prior to running back to the transmission.

The cooling system, which includes the radiator, thermostat, coolant, water pump and radiator hoses, helps regulate the automatic transmission. The transmission does not have coolant running through it; rather the transmission fluid runs through the radiator to cool it off prior to running back to the transmission.

An automatic transmission changes the gears, engages and disengages the transmission and downshifts the vehicles engine without requiring the driver to use a clutch or gear shifter. Transmission fluid is responsible for lubricating and maintaining a proper internal core temperature of the transmission. Transmission fluid should be changed every 50,000 miles under typical driving conditions. Replacing transmission fluid can be cumbersome, and requires dropping the transmission pan and changing all of the gaskets and filters. To avoid these extra steps, the fluid may also be changed via the transmissions dipstick tube.

Instructions

1

Remove the dipstick from your vehicles transmission.

2

Feed the input tube of the petroleum siphon pump (see Resources) into the dipstick tube until it reaches the bottom.

3

Pump the fluid out of the transmission, placing the output tube into a bucket for collecting the old transmission fluid.

4

Remove the siphon tube from the transmission dipstick tube when all fluid has been removed.

5

Place a funnel into the dipstick tube, and pour in one quart of fresh transmission fluid at at time, checking the fluid level with the dipstick after each quart. Repeat this until the dipstick reads full.