A Dual or Double bypass system is what is now common in most current internal combustion engines.
“An approach to better thermal control is to make the bypass the primary path, and reverse the flow. This results in hot and cold coolant being blended before being pumped around the engine. “
The disadvantages are
“Modern engines require even finer regulation of coolant temperatures”
In my opinion
As advanced as our trucks have become the current market economy has made vehicle manufacturers produce budget friendly vehicles that combine vintage and modern technology.
MAP CONTROLLED BYPASS SYTEMS
Throughout the forums when the drive train components are discussed the subject of operating temperatures eventually comes into question.
“While engine wear becomes acceptable at 160F (70C), the sweet spot for emissions, power or fuel economy can be much higher, up to 230F (110C). What's more, there's no one right answer. The optimal temperature is dependent on transient operating conditions.”
“For leading edge engines, this problem is solved by implementing a thermostat map, controlled by the engine ECU. In other words, the engine temperature is varied according to RPM and load under computer control. The mechanism for this is an electronic thermostat”
I see the advantage of an electronic thermostat to be a monitored actuator that needs fewer physical inspections and a more comprehensive component accountability.
Other cooling system components have been modernized by electronic controls for example…
For some time now there have been electric water pumps and although they have their advantages they create additional loads to the electrical system.
The disadvantages of a mechanical water pump is, they are dependent upon a belt pulley system and draw power from the mechanical drive train and are reliant on engine RPM’s