Hey i have a 99 b4 it has made those sounds but only two or three times in the year or so i have had it, do you think this is a sign of it coming on or just a one off thing, and is there anything i could do to prevent it coming on.. i had a 94 tx wagon a few years ago which made the bubling sound all the time, i traded it in to a dealer when i brought a new car and later found out that when they sold it it blew the head gasket... so after reading this ive just clicked and i dont want this happening to my new one.