92 Cummins cold weather mods

Thermostat has two extra bleed holed drilled in it, do it always has coolant flowing through radiator, so when the the stat comes open it doesn't give a huge rush of below zero coolant into the engine..........

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What does having extra bleed hole in the thermostat do? I'm having a major problem with my Thermostat, I am using a lot of coolant and every time the coolant disappears, and I have no idea where its going.