Automobile Engineering in ME
The main characteristics of a maintenance free (MF) battery is that

A maintenance free battery requires little maintenance during normal use and it is sufficient to add water instead of an electrolyte containing sulphuric acid
Since it is sealed, the water in maintenance free battery is not lost through evaporation thus accordingly it is not necessary to top up the cells with water
Recharging of a maintenance free battery is neither required nor possible
A maintenance free battery has a relatively short shelf life when compared with standard batteries

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Automobile Engineering in ME
The function of a radiator fan in the cooling system is that

It cools the engine by blowing air onto the cylinder block
It draws heat out of the engine compartment
It is turned by wind force as the vehicle moves forward, and its rotation drives the water pump
It blows air through the radiator when necessary

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