[FaDuck]

I dont post a whole lot on here, so some quick details.

MAPerformance turbo kit
Fullblown stage 1 shortblock
Delicious FlexFuel tune
450whp on E85 (roughly)

So I went out the other night to datalog a 3rd gear pull for Zach, like I have done many times in the past. But this time, right as I got to redline I got this huge wiff of coolant coming from the vents, and a bunch of white smoke coming out the tailpipes (but only for about 5 seconds or so).

Made it to a gas station about a 1/2 mile up the road. Popped the hood. Coolant was everywhere. The entire engine covered.

The little hose that goes from the radiator cap to the overflow tank blew off.
Thats all I could see. I was eventually able to get about 2 quarts of coolant in before leaving the gas station. No other leaks anywhere that I could see.

Temp held steady at 190-191F the rest the way home, but I had the heater on the whole time.

Drove it to work the next day, and the temp kept fluctuating. It would get up to 203F and then drop fairly quickly back down to about 190F, stay there for a bit, then back up it would go again.

Thought there might be some air still in the system, so I took the radiator cap off and started up the car. Now until the thermostat opened up, I would occasionally see little bubbles. But also, the coolant would slowly rise and start spilling over the edge (is that normal?)

After I let it idle for about 20-30mins I was barely able to get any more coolant in. Drove it home with still the same up and down fluctuation.

While it was parked in the garage I held the throttle at about 2.5k rpms with heater off, and the temp started rising again, but when I turned the heater on full blast it started dropping back down.

The car has always held a very consistant 194F up until this point.

I cant see any smoke coming from the tailpipes, though on startup it smokes briefly. Pulled out the dipstick and the oil didnt seem milky.

Originally thought headgasket, but not seeing any symptoms.

Thoughts?