Why are bubbles in automatic transmission fluid?

Answer 1

Air Bubbles in Transmission FluidThere is usually one of two causes for air bubbles in Transmission Fluid. First, your transmission fluid level may be too low. A low level of transmission fluid will cause the pump to suck up air with the transmission fluid and the result will be air bubbles or foam seen in the transmission fluid when checked on the dipstick. The second most common cause for air bubbles in the fluid is that there may be too much transmission fluid in the tranmission. Too much fluid in the transmission pan can be remedied by draining out some of the fluid. Some vehicles do have drain plugs like an oil pan, but with most vehicles you will have to remove the transmission pan to lower the level of fluid. If your vehicle does not have a drain plug and you plan to remove the pan to lower the fluid level, you may as well change the transmission fluid and replace the transmission filter. Or if you don't want to do it yourself, take your vehicle to a reputable repair shop and have them do the fluid and filter change for you. On most vehicles, changing the transmission fluid and filter is not a difficult task. If you do notice air bubbles in your transmission fluid, make sure you take action immediately as either of the causes above can quickly cause severe wear to your transmission parts.