Thanks for the reply. I am sure it is rain water it only leaks when it rains but don`t know why it comes through the air vents under the passenger seat. I have tried a hose pipe but it does not leak. I don`t know why. I must admit that I hardly use me jaguar not been in it this year. I run it every month to make sure all is okay. There is no sunroof it`s not that. Will keep looking and let you know if I solve the problem.