My car has been dripping out coolant from somewhere. I though it was from the waterpump because the gasket had poped out in one section so I cut it off and put some sealer on it. I get done driving it and there is a puddle of coolant on the water pump again and i see there is some on the bottom of the thermostat housing above it. Well the reason why im thinkin my thermostat might be out is because it will drive around with the temp before the N but when i get on it, it will go up to the N and when i get off again it will go back to half way between N and the blue part. The heater also blows cold air sometime then it will go back to hot? any ideas on whats up?