OPERATING INSTRUCTIONS
F106.7/F106.7A/F156.7/F156.7A
Checking the coolant level
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Risk of scalding through hot coolant and steam. Only unscrew the cooling system cap when the engine is cold and stationary. Never fill cold coolant into a hot engine, parts of the engine can be damaged by the sudden change of temperature. Let the engine cool down to below 50°C before adding coolant. Never mix sealing additives into the coolant when leaks are detected. The additives can clog the cooling system. The reduced flow of coolant in this situation can cause overheating of the engine. Have the cooling system repaired immediately. The coolant must be checked at least once a day to ensure that coolant losses are detected without delay and damage is thus avoided. - Open the engine hood. When the engine is cold, the coolant level must be between the min and max marks (arrow, Fig. 1).
Fig. 1
When the coolant level has fallen to the min mark, more coolant must be added. - Unscrew the cap carefully by approx. half a turn. Any excessive pressure is discharged. - Unscrew the cap completely. - Top up coolant only to the max mark. (For quality and mixing ratio, see engine operating instructions.) - Screw cap back in place. - Close the engine hood.
Topping up coolant The coolant must be a mixture of 50% clean and soft water and 50% antifreeze (ethylene glycol) . (Refilling quantity see: “filling quantities – Coolant”). This mixture offers frost protection down to about -30° and -35°C. A higher proportion of antifreeze in the mixture hardly improves the frost protection properties, but rather impairs the coolant’s capacity to carry off heat. Mix the components in a clean receptacle before filling them into the cooling system. If the proportions are filled into the cooling system one after another, you have no control over the correct mixing ratio. There is also a risk of the components not mixing properly.
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