Water alone is not used as coolant for automobiles.
it is used as a coolant
This is used to keep the motor from overheating and from freezing. Thus the name "antifreeze" and "coolant".
Engine coolant contains certain chemical properties that water does not. Coolant is used in cars, busses, trucks, and other vehicles, and it is never recommended to use water unless it is only a short-term fix until you can get more coolant. The main difference is freezing point. If you use water as coolant in the winter, it will likely freeze and crack your engine block. In the heat, water boils much faster and produces more heat.
good, cheap, efficient and available almost anywhere
The coolant used for a 206 GTI is a mixture. This mixture is Glysantin 33 anti-freeze and corrosion inhibitors mixed with an equal amount of water.
When discussing the use of freon (or chlorofluorocarbon as it is known) it usually refers to refrigeration and air conditioning. When talking about cars, freon gas is used in the Air conditioning unit. It it sometimes used by racing cars in the radiator in leu of regular coolant (or anti-freeze) but this is not a common practice. On regular cars, coolant is an oil based product placed in the cars radiator and reservoir diluted with water. It's function is to allow the radiator fluid (coolant and water), to be heated and cooled beyond the natural point of water to aid in the cooling of the cars engine.
Clean water should be used and mixed with the proper coolant for your car.
I've done some research and GL cars is a used car shop. But are you getting mixed with BL British Layland
A Ethylene glycol antifreeze coolant should be used (Mopar coolant) and mixed with 50/50 with distilled water. Another coolant that is pretty good is the Zerex G-05 antifreeze (approved by Daimler-Chrysler).
Most cars do not have underfloor heating mats. In fact, underfloor heating mats are not used in cars. They are used in homes to clean floors from being cold in the winter.
Water is not used in most modern cars, or at least is not recommended. If it is used, it is because it is cheap and easy to find and will do the job .