I primarly drive very short trips where during almost half my trip the cold engine light is on(the green thermometer light thingy). Its my understanding that the physical coolant thermostat does not open until a while after this cold engine light turns off.
Does having the water pump run during this engine warmup period have any use?
I understand that our physical coolant thermostats have a bypass so it could still be useful for warming up the transmission and the throttle body. but im unsure how useful.
has anyone attempted to measure the amount of power one could save by turning it off? (both in slightly decreased warmup times and in energy wasted by the pump)
Id also like to point out that im not the first genius with the idea of electronically controlling the water pump. Some hybrid vehicles like the BMW i8 use a computer controlled electric water pump