1. Gasket or Seal Failure: Over time, gaskets and seals in the transmission can deteriorate or become damaged, leading to leaks. When the car is not in use, the transmission fluid can slowly seep out through these compromised areas.
2. Loose Bolts or Plugs: If the bolts or plugs on the transmission are not properly tightened or become loose, it can create an opening for fluid to leak out. Vibration and movement while driving can sometimes tighten these connections temporarily, but when the car is stationary, the leak may become noticeable.
3. Damaged Transmission Pan: The transmission pan, which holds the transmission fluid, may develop cracks or holes due to wear, rust, or impact damage. This damage can cause leaks when the car is not in motion, as the fluid accumulates in the pan and eventually drips out.
4. Cracked Transmission Lines: The transmission lines, which carry fluid to and from the transmission, can become brittle or cracked over time, especially in older vehicles. These cracks can result in leaks when the car is not driven, as pressure from the fluid buildup inside the lines is not present to keep them sealed.
5. Faulty Torque Converter Seal: The torque converter, a component in the transmission, is connected to the engine and contains fluid to transfer power. If the seal between the torque converter and the transmission fails, it can cause a leak when the car is not running, as the fluid can drain back into the transmission pan and leak out.
It is important to address any transmission leaks promptly, as they can lead to insufficient fluid levels and potential damage to the transmission. If you notice a leak when your car is not driven, it is advisable to have it inspected and repaired by a qualified mechanic to prevent further issues.
