Theres steam coming out from the coolant resevoir whats that mean?

 

It may indicate the coolant is overheating and releasing into the reservoir due to radiator cap overpressure, or radiator cap could be faulty. It could also mean that exhaust gases are leaking past a bad head gasket. You should be overheating slightly.

Top coolant level in radiator and reservoir and check coolant level for changes. Try removing radiator cap while dead cold and examine coolant in radiator for bubbles shortly after startup. If you get a lot of bubbles, a leaking head gasket is likely.

good luck