Chasing this cooling issue for months
Wish I had a too cool problem. Does your water pump have a bypass??I, d be happy and tune it for cooler temps
Been there and done that, blocked them ALL completely and made zero difference. (Except it was pain to refill it with no way of letting the bubbles out of the system till the thermostat opens)
Running under temp increases engine wear up 400 percent, or I would just deal with it the way it is.
One regular question is "how do you know the temperature sensor is correct?". You are thinking of this since you compare to your engine performance. I assume you are using the small factory sensor screwed into the front of the intake manifold (1/8 NPT thread). If so, I doubt that more external air flow around it would change the reading. I think those are a resistive thermometer (RTD) which is usually a spool of fine platinum wire (maybe something cheaper in automotive). If it was a thermocouple, there are many strange false readings possible from connectors and such, but I don't think they were ever used for coolant sensors. If you have some other after-market or home brewed sensor then air flow might affect it.
Assuming the sensor reads correctly, you might research the "bypass hose" and flow circuit from the water pump to the intake manifold. I assume it is named that because it bypasses the thermostat. Maybe there is supposed to be a flow restriction washer or such somewhere. I have never studied it.
I know for a fact that this is what's happening since I have that tiny flat spot just off the throttle stop at anything under 190 degrees and when the guage starts dropping under 190 the flat spot is there.
It is the thermocouple mechanical type installed in the front of the manifold, and it did the same exact thing with the original electric sensor.
Same readings, same results with both types.
Now, how is it possible that coolant is getting circulated at 175 degrees with all that blocked off bypass and heater stuff? ???
Sorry, had to edit this answer.
Lets say just for kicks that the guage is wrong and it's actually running at 195 when the guage says 175.
So when the gauge says 210 what would the temp actually be?
230 right?
Theres no way.
This is what makes me pretty sure of what's happening as well as the flat spot being there.
