Re: Engine Thermostats - Old vs. New

Posted by JWL On 2023/10/6 12:52:22

Back in the day cooling systems were serviced twice a year: In the fall to add antifreeze and a thermostat; and in the spring to flush the system, add water with a water pump lubricant and remove the thermostat. When the thermostat was removed it was "gutted" and the base reinstalled so as to keep the flow rate restricted. Rinse and repeat.