It is possible for radiator fan to spin in a wrong direction due to placement or connection. This can cause engine overheating and also waste energy. It is sometimes difficult to track this fault since the fan still rotates.
There are different ways of bleeding different cooling systems. Some methods are not very easy and straightforward and requires some level of expertise. This quick method can be used by an average car user.
Coolant getting into the engine lubrication system can cause damage to the engine. It is mostly caused by a faulty head gasket, bad radiator that has oil cooler integrated in it or a bad engine oil cooler.