Hydronic AntiFreeze system refill August 02, 2017, 03:13:17 pm Yahoo Message Number: 111912I need to refill a few gallons of antifreeze into my Hurricane furnace system. I replaced the circulation pump in a side bay (low point in system). I have looked under the passenger dash, in the engine compartment and in the bathroom above the furnace compartment and NO obvious refill point for the antifreeze. My coach is 2003 36' Intrigue. Anyone have any idea as to where there is a specific refill cap/tube? I do not believe the furnace system is tied into the engine cooling system.Dave W.