My coolant overflow bottle isn't functioning like my other two Eagles have and did. My 85 Eagle has a new radiator, water pump, thermostat, and temp gauge is right on the money, no overheating, but I noticed my coolant bottle isn't recirculating as my other's have. I've added a coolant additive in the overflow bottle/recovery, and it hasn't recirculated in the cooling system. My other 2 Eagles did it no problem. The hose from radiator to overflow bottle isn't plugged, the radiator is filled to the top. It puzzles me. Help!