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Even without the bypass, a missing/removed thermostat can and will create an eventual overheat because the coolant is not allowed to stay in the radiator long enough to shed the proper amount of heat, so yes make sure there is a thermostat. Unless it overheats in 5-10 minutes, it takes longer to overheat without a thermostat as opposed to say a plugged radiator or a stuck closed thermostat, but it WILL eventually overheat.
Gilly
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