I recently purchased a 2001 Range Rover and instantly fell in love....... I did have a pre-purchase inspection done and with the exception of some minor things it passed with flyer colors. However the other day I got in it and started it up and it sounded like water boiling. Usually when I turn on the heat. Thats the best way I can describe it...... anyone that could maybe shed some light on this would be greatly appreciated. THanks !