Posted 3/8/2014 22:15 (#3742363 - in reply to #3742253) Subject: RE: Cummins M11 coolant line at front of exhaust manifold?
Between Omaha and Des Moines, 7 miles South of I80
Your describing a coolant vent line going to a coolant expansion tank.
Bleeds off some small amounts of air, if there is some in the cooling system. Also, helps to bleed air, during the initial fill of coolant anytime a system was refilled.