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Yes.

But running without a thermostat will cause the engine to be overcooled, because the restriction normally provided by the thermostat on the flow of coolant from the radiator around the engine has been removed, so too much coolant will flow and the engine will run too cool.

If the engine is not up to temperature it uses more fuel, will produce less power, will wear more, and will not heat the cabin heater as well. So it's not a good idea to run without a thermostat.

It is acceptable to run without a thermostat in an emergency, e.g. if the thermostat has failed and doesn't open, causing the engine to overheat. Just make sure you replace it as soon as you can.

Running without the thermostat may also trip the check engine light to come on.

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10y ago

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