The coolant consists of a mixture of anti-freeze and anti-corrosion agents (antifreeze) and water. The anti-corrosion agent, which is part of the coolant, prevents the formation of scale, rust and other aggressive corrosive substances in the cooling system. After about four years, this tool loses its effectiveness, after which it must be changed. However, the periodic replacement of the coolant has recently not been prescribed by manufacturers. Depending on the selected antifreeze, the proportion of water in the coolant reaches 60%, but this proportion should not fall below 40% even in summer.
Thanks to its high boiling point under heavy engine load, the coolant contributes to increased operational safety of the vehicle, especially in countries with hot climates. Frost protection must be provided down to approximately -25°C (in areas with a cold climate down to about -35°C).
All engines are filled with antifreeze G 012 A8 D in accordance with the TL VW 774 D standard, this antifreeze has a red color. Under no circumstances should this agent be mixed with the previously used G 011 A8 C antifreeze (Green colour) or by other similar means. Otherwise, severe engine damage may result. The brown color of the coolant indicates that it was obtained by mixing different antifreezes. In this case, the coolant must be drained, flush the engine with water (the engine must run for two minutes), then refill with new fluid!
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