Loosing antifreeze

You put another gallon of oil in after it started to run hot?

NOoooooo! I changed the oil to make sure there was NO coolant in it, went to store got gal of oil, and filled the rad. with water this time around. Thermostat is still out. It was a new 190 degree but it could be junk. I have not had time to test it. Still see no leaks. Ran it down the road a couple miles and did not get past the 1 /4 mark.
Trying to finish some filler on the Toad today and just not enough time to do everything! 150% humidity SE Tx does not help us old folk
Net I want to pull some plugs and see what they look like. But tomorrow is day and running here and there! Bout tired for one day!