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The appropriate method for checking the automatic transmission fluid involves both hot and cold checks. This dual approach is crucial because the fluid level can vary significantly between the two states.

When the transmission is cold, the fluid occupies a different volume than it does when it is hot. The cold check allows the driver/operator to observe the baseline level of the fluid when the system is not in operation, ensuring that there is sufficient fluid present before starting. Conducting a hot check, on the other hand, involves running the engine and transmission to the normal operating temperature. At this point, the fluid expands and circulates throughout the system, providing a more accurate reading of the fluid level when the vehicle is under typical operating conditions.

By performing both checks, the driver/operator ensures that the transmission fluid is at the correct level under various operating conditions. This practice is essential for maintaining the efficiency and longevity of the transmission system, as fluid levels that are too low or too high can lead to improper operation or damage.