Is there a technique to purge any air pocket from the water heater lines. After replaceing collant hose and water pump, engine overheats within minutes or withen an hour. Steam pressure develops at highest point due to air pocket at water heater and causes engine to over heat. I Removed the thermostate, still had same results.Disconnected lines from water heater and went direct to engine. No problems with over heating now but would like to get water heater back on line. I pressure tested water heater and coil is good, heater works fine on elec power Catalina has the water heater higher than the engine which i'm told has this problem, but do not know how to purge air out.
1985 catalina 30' air lock on water heater from engine collant side
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