If your coolant is brown it is because of the block rusting from not having a correct amount of antifreeze with rust inhibitors in your cooling system. That happens when you run straight water.
Air gets into the system for a reason, because coolant is leaking out. If its not leaking on the ground then like ddmcse said, its not miller time but BHG time.
This is what you should do, go buy a block tester, some cooling system cleaner (comes in pints at the autostore, its meant to clean the cooling system) and some coolant and distilled water. Drain the radiator until you can't see coolant anymore, about a quart or 2. Block test it. If its ok, then drain the rest of the coolant and fill it back up with tap water and cooling system cleaner. Run the engine with the heater on til its warmed up. Then drain the radiator again. Fill with coolant and distilled water.
If you put just tap water and the cleaner in, which are both clear, watch the color of the liquid that comes out of the radiator, it will make the hair on the back of your neck stand straight up.
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