Keep the original spec for the thermostat (195 F) If all is working well, then the engine will maintain this (actually a few degrees higher) no matter what the ambient temperature is.
Water plus anti-freeze is necessary in all vehicular engines for all climates. This is because anti-freeze contains additives for corrosion.
If you are having problems keeping the temperature down, then you have a problem that needs to be addressed! No other way around it. Take no short cuts either.
Start with a good flush and re-fill of 50/50 water plus any normal type anti-freeze, and also replace your thermostat while you are at it. Then reevaluate the situation.
Water plus anti-freeze is necessary in all vehicular engines for all climates. This is because anti-freeze contains additives for corrosion.
If you are having problems keeping the temperature down, then you have a problem that needs to be addressed! No other way around it. Take no short cuts either.
Start with a good flush and re-fill of 50/50 water plus any normal type anti-freeze, and also replace your thermostat while you are at it. Then reevaluate the situation.