Last year I posted about the expansion/holding tank in my Espar Hydronic 4, and ultimately we had the plastic "overflow" tank that was leaking with a proper metal expansion tank. Everything worked fine.
Last week the header had trouble starting, exhibiting a similar pattern to what happened when the coolant
leaked last time. Today, same behavior, so I climbed in to the lazarette to check it out. Sure enough, it's leaking again, but from the coolant
I don't think it's had enough failed start cycles to lock itself out yet so I thought I'd try to fix it myself (this heater
has cost me more than any other single
item since I've owned the boat!)
Attached are pictures.
I generally know what to do but not necessarily how...close valves on coolant lines, remove/replace section of hose and clamps, refill coolant to recommended level, and bleed the system. So I have some questions I'm hoping someone can help me with!
1. What is the correct coolant fill level (assuming I add coolant to the overflow tank?) I've seen this level mentioned but no one has said what it is.
2. How do I bleed the system? I know where the bleed screw is but I'm not sure of the procedure. Is it the typical open the bleed valve and start the heater
, then close the valve when air stops coming out?
Any help would be greatly appreciated!