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this might be a stupid question but need to rule it out.

if i had mainly/only water in my coolant system would that maybe be a cause of it losing water?

does proper coolant raise the temperature that it will evaporate at? sometimes when i had stoped i could hear what seemed like vapour escaping through the small hole on the side of the resevoir.

it is only a small amount of water and mainly when it is really hot.

sometimes the fan keeps going longer than you would expect and the engine is hotter when I stop, does coolant help it cool down better than water? i.e. does it cool the engine down more than water?

Always use coolant, it wont freeze unless very cold in the winter, thus preventing split/burst pipes or radiator. Also it has anti-corrosion properties so the inside of the coolant system and radiator wont rust. If is does rust then you'll probably have brown coolant forever.

I'm not sure about the evaporating but really just use the proper stuff, its used for a reason.

ok, thanks.

where shuold i get it from and what is the right type? (just ordered haynes off amazon)

is it best to use vw stuff and etter to use purple? don't know which one the garage used when they changed timing belt/water pump.

use any i use the stuff from motorworld