If you remove the thermostat, the water will cycle all the time... causing it to take longer for the engine to get to the correct operating temp. The thermostat closes to keep water in the block/head until it is at operating temp (usually around 180deg) then it opens and closes as the water temp rises and falls. Also if you live in the north you will want to have a thermostat due to the fact that the heater will not work for a while when you start the car. It will take much longer to heat all of your water, instead of only whats in the block/head. KEEP IT!
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