Should you run a car without a thermostat?

340_833 dart said

Besides, if thermostats weren't necessary, I doubt Ma Mopar would have put them in the engines.

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They are necessary in cool-cold weather. As for the manufacture advice, of course they will say you need to buy their parts, even in the summer run our Thermostat and if it runs hot well we sell new fans and radiators also. They are not going to offer a free fix tip