In Reply to: Re: 52 8N radiator thermostat posted by 36 coupe on June 10, 2017 at 07:05:29:
The purpose of a thermostat is to slow down the water flow in the cooling system allowing for heat absorption. Coolant then flows to the radiator and the air flow past the thinner tubes cools the liquid before returning to the engine. If the coolant flows too quickly, it will not have enough time to absorb the heat. It is also possible to achieve the same action with a restriction plate in lieu of a thermostat. Some thermostats come with a small hole drilled into the mounting flange and this aids in the release of air pockets behind the thermostat during the initial installation as well as improved cycling action during engine operation.