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Well, basically think of it like this. Your water pump is pumping away like the little pump it is... and from there... the water can go to two places... 1) it goes to your radiator where it is cooled... or two... it goes out your coolant bypass line and recirculates throughout the motor. When the thermostat is closed, no cool water comes from your radiator... and to prevent any pressure from building up in the radiator... the water is recirculated in the block. As the recirculated water heats up.. the thermostat opens up.. and lets the cooled water come in.
Now... what does this mean for you? A sticky thermostat keeps your radiator from giving you cool water. =D But like I said.. also check for collapsing hoses... and do a good flush just to make sure you are getting proper flow.
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