![]() ![]() ![]() Measuring the inhibitor levels is impractical in the field so the next best thing is measuring the coolant/water concentration. Heater cores are so thin that using worn out engine coolant can destroy a new one in just a few hours! Manufacturers in their quest to obtain the government mandated fuel mileage requirements have lightened the weight of every component including cooling systems, radiators and heater cores. An engine coolant replacement protects them from erosion and corrosion. These inhibitors are what protects the metals inside the engine, radiator, heater core and water pump. This extra heat attacks the inhibitors in the engine coolant and required a rethink of the engine coolant formulation. Full time operation mechanical fans have been replaced by on demand electric fans. Cooling systems, radiators, and heater cores capacity is smaller. Today the cooling system runs hotter, typically around 240 degrees Fahrenheit. We performed this cooling system service typically every fall. The procedure then was to add some chemical cleaner to the radiator, allow it to run for 15 to 30 minutes, open the radiator drain, and insert a garden hose into the radiator to perform the coolant flushing. The cars had extremely large cooling systems, radiators and multi blade mechanical fans that ran continuously. In those days the engine coolant rarely exceeded 200 degrees Fahrenheit. This was a good idea as most of the demands placed on the coolant system were the possibility of freezing, with a small focus on heat. Years ago people went to the mechanic yearly to test the coolant or perform a cooling system flush for winter to protect their cars from freezing. ![]()
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