In Reply to: 2n cooling issue posted by Steve Frysinger on November 04, 2017 at 15:44:48:
Thermostats are a restriction in the cooling system which slows the coolant flow through the engine down. The purpose of that is to allow the coolant to have enough time inside the engine for heat absorption. Then it passes into the radiator and air flow cools it before returning to the engine. Thermostats also maintain engine operating temperature and reduce the build up of oil sludge/gunk in the engine.
Your immediate steaming might indicate a plugged radiator.