Quote:
Originally Posted by fatlazyless
Remove the thermostat round plate which is easy to do, otherwise it will act like a closed valve to the flow of coolant/anti-freeze.
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All thermostats have a small bleeder bypass built into them usually on the housing which allows some fluid and also air to pass through whether open or closed. The purpose of that is to prevent pressure buildup unequally on either side that may prevent it from opening up or burp the system so the thermostat is not sitting in a pocket of air. In other words the thermostat does not completely cut off flow, only restrict it until sufficient operating temperature has been reached. At least that is the way mechanical thermostats work.