The thermostat uses the temperature of the coolant on the engine side to decide how far to open, its a valve. The more coolant it flows, the more goes through the radiator=the cooler the engine runs. For everything to work properly you NEED a thermostat, you will get weird issues with gas mileage and things like that without a thermostat, its possible to overheat without a thermostat because coolant travels through the radiatior so fast that it doesnt have time to cool. Install a thermostat.
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