My car seems to leak coolant or it is not being distributed through the engine.

Often times the stop leak can cause a restriction. I suggest replacing the radiator and flushing the system multiple times. You can also use a coolant system cleaner that they sell at every auto parts store.If you don't work on your own car then use this link to find a good shop near you. https://repairpal.com Alex

It is possible that the Coolant level is low and you have air pockets in the system. It is also very possible you have a failed head gasket as you stated it overheats which may have warped the cylinder head which will force combustion gases into the cooling system which will push coolant out of the over flow tank. If you'd like to schedule an appointment for diagnosis on this issue please feel free to contact us. The sooner the better to hopefully head off any further damage to the engine. 513-442-9918 Or message us on Facebook