What's up my.is? I don't usually post much so sorry if this is kinda off. I have a 2002 IS300. So yesterday I noticed my car was leaking coolant after I parked the car. It would only leak when I start my car but after I turned it off and let it sits for awhile, it will eventually stop. I was hoping it would just be a hose or something. I looked underneath my car today and saw it was coming from this open ended tube right next to the alternator that is pointed down wards. I have no idea what this tube is for and it was hard to trace it because a couple things are blocking it and I couldn't see that tube from top. Has anyone else had this problem or can point me to the right direction would be very appreciated. Thanks in advanced!