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..........
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.[/QUOTE]
The extra holes allow more coo;lant to flow past the thermostat into the radiator and keeps the coolant in the radiator warmer. The purpose of this I believe to keep the coolant in the radiator from "cold" falshing the block when the thermostat opens. You would have to realize that he is operating his truch in like -40 degree temps.
Tell us about you vehicle first before we can take a guess where your coolant might be going??????
