I'm new to these forums I got a 84 318i with the m10..Now my problem is I purchased a overfill container for the radiator and I put some coolant in there. My car recently started over heating to the point where it was shooting coolant out of the cap, I replaced the cap and I can squeeze the overfill container and coolant still comes out from the new cap.. anyone have any suggestions? I am also working on a head gasket replacement cause it was blown.