Burping air out of coolant system

[grahamdouglass]

I recently changed my water heater, in doing so I introduced air into the freshwater coolant system of my Lehman 120 hp, 2715E engine. I picked up one of those coolant fill kits but all the adapters to the radiator are for automotive. Have any of you found a radiator fill adapter for a coolant kit? Do they stock them on Amazon, I’m having a hard time finding one hear in Vancouver, BC

I’ve been phoning around and the radiator guys just say run it with the cap off and the air should escape no problem. Does this make sense?

 

[Comodave]

That is what I did to the Lehmans in our last boat when I changed the coolant. Same with my Cummins in the current boat l

 

[Bacchus]

I had an old mechanic tell me to just drill a small (1/8") hole in the thermostat to bleed the air. The beware Yanmar Tstat i ordered came predrilled. No problem bleeding / filling

 

[jleonard]

Ive also ran n my Lehman with the cap off to purge air. Ive done that on older cars also.