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The problem you run in to by not having a tstat, is under extreme hot conditions, the coolant may not be staying in the radiator long enough to get all the heat out that the radiator is capable or removing. It's not like the coolant will ever come out "cold", but if it isn't regulated by the tstat, it can and will cause an overheat condition. Under the right circumstances I have seen this happen on fairly nice days, doesn't have to be a "scorcher" of a day, but usually it is. You are better off having a tstat.
If you didn't flush the block out with distilled water, you still had hard water in the block. I know the water in Florida is typically very hard and full of sulphur. Could have run a few gallons of distilled through the block before starting in with coolant.
Gilly
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