Can a Car Work Without a Thermostat

A car without a thermostat would never even warm to operating temperature, much less overheat. The lack of a thermostat would create a constant flow of coolant through the engine, thus a constant cooling effect on the engine. … In this case though, the thermostat is not present, so this would not be a problem.

Is it OK to run an engine without a thermostat?

Generally it should be ok to drive without the thermostat fitted, as it will only cause the engine to take longer to reach operating temperature. The thermostat is designed to allow the engine to reach ideal operating temperature as quickly as possible, so it would not be recommended to drive without it.

Will a car heater work without a thermostat?

Yes you can run the heater, however, without a thermostat your engine might not reach operating temperature, at least not under most common circumstances. That means your heater might not be as warm as it would be if you had a proper thermostat installed.