What should be visually inspected on an automatic transmission to check for leaks?

To check for leaks in an automatic transmission, visually inspecting the transmission pan is essential. The transmission pan serves as the reservoir for transmission fluid and can be a common site for leaks due to its position and the nature of its function. Over time, gaskets or seals that are part of the transmission pan can wear out, crack, or become dislodged, leading to fluid loss. By inspecting the pan, technicians can identify any signs of fluid accumulation or drips that indicate a leak.

While the color of transmission fluid can provide insights into its condition, it does not directly indicate where a leak might be occurring. Similarly, inspecting components that are unrelated to the transmission, like the engine oil filter or fuel injectors, would not assist in identifying transmission fluid leaks. Therefore, direct scrutiny of the transmission pan is the most effective way to assess for leaks in the automatic transmission system.