Thanks for the explanation.
I was suspecting the thermostat at first but it seems fine because when I idle it, the temperature stays right in the middle.
So the fact that the car runs cold only at high speed makes me think that high flow of air combined with stuck clutch fan(spinning around 3K rpm @ 70 mph) cools down the engine too much.
Cost of replacing clutch fan seems to be equivalent to getting an e-fan and I heard good things about e-fan so I'm debating!
How is your fan's air flow at idle?
I cannot quite determine whether mine is broken or not but it makes lots of air flow at idle no matter what the temperature is.
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