Join Date: Aug 2010
Location: The Bahamas
Thanked 120 Times in 118 Posts
Rep Power: 9
Re: Universal Engine 30 - m4-30 Coolant
I would fill it, run for a few minutes after thermostat opens, shut down, then check again.
Mayve had trapped air.
Other would be to pull HX....prob good to check that anyway since is new boat to you.