Operating instructions
F106.6 / F106.6A / F156.6 / F156.6A
Checking the coolant level
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Risk of scalding through hot coolant and steam. So unscrew the cap of cooling system only when the engine is cold and stationary. Never fill cold coolant into a hot engine. Parts of the engine may 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 might clog up the cooling system. The reduced flow of coolant can in this case cause overheating of the engine. Have the cooling system repaired immediately.
Fig. 1
When the coolant level has fallen to the min mark, more coolant must be filled in. - 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).
The coolant must be checked at least once a day to ensure that coolant losses are detected without delay and damage is thus avoided.
- Screw cap back in place.
- Open the engine hood.
- Close the engine hood.
When the engine is cold, the coolant level must be between the min and max marks (arrow, Fig. 1).
Coolant refills The coolant is to consist of a mixture of 50% clean and soft water and of 50% antifreeze (ethylene glycol) . (Refilling quantity see: "Refilling quantities other"). 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 proportions in a clean recipient 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 moreover the risk of the proportions not being mixed properly.
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