Coolant and clamps

So this evening I mixed 6 litres of 50:50 G12 type coolant with deionised water, because Google seems to think that this is better than plain or I forget. I am also told water is just fine so regardless I had already ordered the deionised stuff. 

Happily when I completed filling 4 1.5 litre bottles (that had G13 in them at one time) I realised the remaining 2 litres in the 5 litre coolant and deionised water containers would also nicely mix so the water will not freeze in my garage.

Then I blew out remaining water from the system using an airline. It was pure water because I had topped it up so much during chasing down the vacuum leak for the overflow system there was no proper coolant left at all. 

I gather G12 is ok for old cars whereas G13 is not; something to do with the solder used in the heater in days gone by.

All hoses now have "constant pressure" clamps on the silicon hoses. The idea here is that to constantly "nip up" jubilee clips on silicon hoses leads to their being too tight or too loose or I suppose both as the heat cycles hot and cold. 

Having tested the vacuum and finally proved with the last adjustments there are no vacuum leaks I will use the vacuum system to fill it with coolant that will be drawn in as I release the vacuum. This way there are no air pockets and we know the system is full.

I never imagined coolant could be so complicated, all really occasioned by the failure of the overflow system to return it's overflowed contents back to the system, because the system was losing it's reduced pressure (what we loosely call vacuum) through several different methods and I had to track down all of them. This meant replacing most of it - the stat housing, the rad cap, the overflow hose, the gasket seal to the housing and then checking all the hose clamps - hence constant pressure ones now in use. 

A modern pressurised system would be far more practical and when it leaks because it is under pressure it is relatively easier to locate the leaks whereas with reduced pressure, you can't easily find this.

Have I missed anything?

Anthony - experimenting!