I have some questions on my b16a3 swap into my crx 1. where the lower radiator hose goes into the back of the block what is that brown plug? do I need that hooked up? 2. my heater is blowing colder than when I had the sohc and I was wondering if that was normal after you do a b16 swap? 3. I have been checking a coolant level everyday and I have to top of the radiator every day, I am thinking its air bubble in the system that they did get out when the swap was done, I can see any leaks, what do you guys think?