Okay, so I got the newly rebuilt D16Z6 put into my 92' Hatch. Everything is running great except that after I drive a while the coolant reservoir fills up all the way. What the hell could it be? It's starting to over heat a little bit but only after about more than an hour of driving. The radiator is new, the thermostat is new, the cap is new, the head gasket is new, the water pump is new. So what gives? I'm only losing coolant because is leaking out of the top of the coolant reservoir. Thanks. I want every issue taken care of before I boost it.