2002 Jaguar S-Type Q&A

2002 Jaguar S-Type Question: all of a sudden this am there is a rather loud whining---only when it drives.

The car drives smoothly and there is no error/fault that appears. There has never been a noise like this before. thank you -
Answer 1
is there a crack on ur coolant reservior. do u notice any fluid on the ground when u leave -