yeah no........ let your car reach open loop. in the daytime look for a leak, could be on the thermo housing and running down the hose. if i were you id pressure test the whole system and look for a leak.
prity sure if its not evaporating inside a hot radiator it doesnt evaporate instantly once out of there. also the coolant leaves a residue from where its been and shows up brilliantly against black. i felt all the hoses and plug and stuff while the car was still running. when i got home i let it run with the heater on for half an hour. let it then cool for 4 hours and everything was still completely full. il have to look into it further but at the moment im just confused lol. this hang over isnt helping