We should differentiate between permanent or all-year-round fluids and ordinary cooling fluids only used in hot climates. There are currently two types of fluid - C and D. Type D has the advantage over C of being longer-lasting and both contain, amongst other things, additives such as triazole which is required for protecting copper elements (thermostat, temperature probes).

There is a golden rule to follow in all cases : the two types should never be mixed otherwise the cooling circuit could be damaged.

Cooling fluids are not as good as water at conducting heat but, on the other hand, they do not rust equipment and are not subject to cavitation (the change from a fluid state to a vapour state causes shock waves which are destructive to equipment).

Analysis sequence :