I really don't want to drain the coolant but it appears to be the only way to get this little heater off to access the floor as it is attached under the bus. I'm really thinking about just cutting around it and cutting plywood to fit around it. My gut tells me I should probably just drain the coolant and do it but it's so small and the cockpit area isn't as important to me. Anyone else run into this personal dilema?
On a better note I did get the ceiling down yesterday night. Used air chisel to punch out the middles of the rivets then a normal her and cold chisel to smack the heads off