I have a 99 7.3 with 160k miles, it has been sounding like an air compressor pumping air for a while then this week I noticed a lot of extra smoke coming out the exhaust while idling. Same day I noticed the smoke I turned the heater on and smelled antifreeze but the air was cold then going down the road it started running hot 230, I stopped pulled the oil stick out and white smoke was coming out the dip tube. I'm guessing a head gasket but not sure the best way to tell or what else to check, thanks