I just started using Engine Ice last week and was wondering if anyone else had noticed any strange sounds coming from the radiators when using it. When I was at the track saturday and started the bike (it was warm), I thought I heard a gurgling like sound coming from the radiator. At the time I wasn't sure if I actually heard it or if it was just a sound from something else in the distance. But tonight I fired it up in the garage and I swear I heard it again.. Anyone else had this experience??