What is the danger of driving with an automatic transmission leak?
The extent of danger depends on the leak. For instance, a cooler line that is loose or a bad cooler line hose can suddenly blow all of the fluid out of the transmission. This combines a huge fire hazard with the likelihood of almost immediate transmission failure. Any leak is likely to get worse in time. Losing transmission fluid deprives the automatic transmission of lubricant and hydraulic fluid. Automatic transmission fluid is also very flammable and deteriorates bushings and rubber suspension components quickly. It is very unwise to leave transmission leaks unattended.
