It opens when hot and closes when not hot. If you don't know how to replace one of these, see where it is located on your engine. . If you're happy with that, buy this, a gasket made specifically for your car, some antifreeze/coolant (it's the same thing, but we call it coolant more often here in the desert), and paper towels. They wear out and will probably need to be replaced at some point and this is a very simple repair that you can do in your driveway/parking lot at your apartment and will save you money rather than taking it to the store.
853240, stainless steel
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