A car is running on many fluids that are separately responsible for multiple tasks and running the different components. Transmission fluid is among the important fluids used in the car that lubricates the parts of the transmission system and lowers the friction between them. They are further responsible for preventing rust and ensuring the smooth operation of the gear.

Do you realize how important this fluid is? But if you do not take care of transmission fluid, it may put the transmission system at risk. Apart from the risks, there is trouble that may happen with it and may cause trouble for the driver. Many times, the bubble formation occurs in the transmission fluid which may degrade its quality and may abruptly affect the car’s overall performance. 

What causes the bubble in transmission fluid?

You first need to know the reasons and causes of bubble formation in the transmission fluid to better fix the issue later in your car. It is not necessary that the issue will only appear in the older and used cars, but it may happen with you even if you are diving a Toyota Hilux Thailand which is in top-notch condition. All that matters is how well you keep your car. 

When you overfill the transmission fluid in the car

Drivers frequently believe that adding more transmission fluid is preferable to operating at low levels. Overfilling the transmission, however, can cause major problems. The fluid cannot adequately circulate throughout the transmission system when the fluid level is higher than is advised. When the engine runs, the extra fluid combines with the air in the gears, causing bubbles or foam.

This foamy liquid will not be able to lubricate the parts of the transmission and gear system leaving them having wear and tear. Further, the frequent overfilling of the fluid may damage its parts and shorten the lifespan of your car. 

When you underfill the transmission fluid in the car

It is not always the case, that only overfilling will cause bubbles in the transmission fluid. The underfilling or filling very small amount of fluid may also cause bubble formation. The internal parts of the transmission, including the gaskets and seals, are more prone to deterioration when the fluid level is too low. This may result in leaks that let air into the system, tainting the fluid and causing bubbles to form.

Remember that low fluid levels can also lead to transmission overheating, which will further cause major damage or even a possible fire hazard from fluid leakage. Hence, you must often monitor and maintain the proper fluid levels in order to prevent these problems.

When you use unclean or clogged filter

To keep the fluid clean and functional, the transmission filter is essential in eliminating contaminants. Bubbles in the fluid may result from the filter introducing air into the transmission system due to clogging or corrosion. If the filter is not put appropriately, air may be drawn into the system and cause this problem as well.

A damaged fluid can severely affect the ability of transmission fluid to lubricate the gearbox. This will later lead to component wear and even transmission failure. 

When you mix additives with transmission fluid

The transmission fluid may be mixed with additives during periodic maintenance or modifications. But not every additive works well with the transmission in your car. For example, adding additives like borax, soda, or chlorine to the transmission fluid can result in a new mixture that is completely inappropriate for your transmission.

Reduced lubrication and cooling capacities can result from fluid foaming when the incorrect kind of fluid is used or when incompatible additives are used together. Over time, this may cause serious harm to the transmission, including possible failures that necessitate expensive repairs.

When the transmission pump is broken

The transmission pump is in charge of keeping the proper pressure in the system and moving the fluid throughout the gearbox. Fluid bubbles may arise if the pump breaks down or becomes damaged, allowing air to enter the transmission. 

Insufficient fluid circulation due to a malfunctioning transmission pump can also result in the transmission overheating and eventually failing. If there are any problems with the transmission pump, you must fix them right once to avoid permanent harm.

Why bubbles are bad for the transmission system?

Although transmission fluid bubbles may appear to be a small problem, they can have a big effect on how well your car runs. These air bubbles can lead to issues in the following ways:

Reduced Heat Transmission

Scattering heat produced by the working parts of the transmission requires transmission fluid. The efficient transport of heat by a fluid is hampered when bubbles are present in it. The accumulation of heat in certain regions where friction arises may cause overheating, speeding up the deterioration of the transmission's parts.

If this overheating is not stopped, the fluid may oxidize and take on a burnt, brown colour and strong odour. When this occurs, the transmission fluid as a whole may be necessary to get the system working again.

Aeration of Transmission Flowing

When air bubbles mix with the transmission fluid, a process known as aeration takes place. This phenomenon can cause serious problems for the transmission system. Reduced lubrication and cooling efficiency of aerated fluid can cause overheating, increased friction, and finally component failure in the transmission's internal workings.

If this issue is not fixed right once, it may also result in slipping gears, irregular shifting, and even complete transmission failure. It's imperative that you respond as soon as you detect bubbles in the transmission fluid because of this.

Takeaway

Transmission fluid bubbles are more than just a small annoyance; they are an indication that there is a problem with your car's gearbox. You can protect the integrity of your car and save money on future repairs by being aware of the causes and effects of bubble development and taking proactive measures to resolve the problem.

Keeping your car’s transmission system in top shape requires routine maintenance, which includes monitoring fluid levels, changing out old or contaminated fluid, and looking over important parts like seals and filters. You can guarantee that the transmission system in your car is dependable, trouble-free, and efficient with the correct maintenance.