Hi everyone. I don't use my factory charcoal filter and was thinking about removing it. I'll keep it. Just put it away for now. In the same position/location that the filter occupies, I was thinking about installing a coolant recovery tank. Not just an overflow tank, but something that holds the overflow antifreeze and the system can suck it back into radiator. Here is my concern. My radiator fluid when cold is about 3" or so down from the top. I'm told this is normal because the fluid/antifreeze needs room to expand. The 3" of missing fluid doesn't seem to affect the temp. of the engine. Not really sure. But, if I had the radiator near full cold, when hot it could expand into the recovery tank and draw back in as needed. Maybe this extra coolant would make the engine run even a little cooler. Anyone ever do this or have any thoughts on it?? Thank you.