on the box of the thermostat, there should be a number as in: 160, or 170 or 180; If it says 170, that is when the thermostat starts to open, (farenheit). The thermostat opens all the way when the coolant/water gets hotter. Even though the ka24de on s13/ s14 only has 160hp at the crank, and is stock, They are well known to over heat.
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