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Originally Posted by mikefocke
I presume you are reading the temps off the guages.
Driving the accessories at a slower rate would spin the water pump slower which would evacuate heat slower which would mean that the water getting to the radiators would be hotter wouldn't it?
What am I missing here? Make any other changes?
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You have to look at this as a temperature difference situation. If the engine is dissipating a set amount of heat, it is true that the slower the coolant flows, the higher it's temperature rise will be. However, the heat then runs through the radiators, and the slower the coolant runs through the radiators, the more heat they can drop into the air. The radiators can bring the coolant temperature closer to the outside air temperature at lower flow rates.
The balancing act is controlled by the flow rate of the coolant. It is conceivable that the coolant temperature is actually reading lower if the sensor is at the inlet to the engine. Chances are that the temperature at the outlet of the engine and into the radiators is running higher with the underdrive pulley.
Where you measure anything is always important to consider.
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