Technician A says that a leaking transmission line may be found by using a dye. Technician B says that a transmission leak would likely appear as a red fluid. Who is right?

Both technicians are correct in their assessments regarding the detection of a transmission fluid leak.

Using a dye to identify leaks in the transmission system is a common practice in automotive diagnostics. When a dye is added to the transmission fluid, it can help highlight the source of the leak when inspected under UV light, making it easier to pinpoint the exact location.

Additionally, transmission fluid is typically red in color, which is a characteristic that allows for easy identification. If there is a leak, it often manifests as a red fluid, making it visible on the ground or components around the transmission area. The presence of this distinctive color serves as an indication of a possible issue with the transmission system.

In summary, both the use of dye for locating leaks and the identification of leaking fluid as red are valid methods for diagnosing transmission problems, making the assertion of both technicians accurate.