This little part basically controls the flow of coolant through your engine. Coolant, you know, that green or orange stuff, picks up heat from the engine as it runs. The thermostat decides when to let that hot coolant circulate to the radiator to get cooled down. It’s a valve that opens and closes based on engine temperature. The O – ring just seals everything up nice and tight so you don’t have leaks. Think of it like this: your engine gets super hot when it's running, and the coolant is how it keeps from melting down. The thermostat is the gatekeeper. When the engine’s cold, it keeps the coolant inside the engine block to help it warm up quickly. Once it’s up to temperature, it opens up and lets the coolant flow to the radiator to cool things off. It’s constantly adjusting to keep the engine at that sweet spot. If this thing fails, you're going to have problems. If it gets stuck closed, your engine will overheat, and that’s a really big deal – can cause serious damage fast. If it gets stuck open, your engine will run cold, which means it won't run efficiently, your heater might not work well, and you’ll wear out parts faster. You’ll notice if it’s going bad – overheating is the big sign, or maybe the temperature gauge fluctuating all over the place. We carry these pretty regularly, you can find a good selection at Fixparts Online, or we can order one for you. It’s a relatively inexpensive part to replace, but it can save you a ton of money on bigger repairs if you catch it early. Shop with confidence: Thermostat with O-Ring (MPN 17978) comes with a 3 year manufacturer guarantee!

About Febi

Ferdinand Bilstein is well known for reliability and is trusted by repair professionals worldwide.

Why Choose Febi?

• Febi parts are made to the same standards as original equipment, so you know they'll fit and work well. • We offer a really wide range of parts – everything from engine components to wear and tear items – so you can find almost anything you need in one place. • Febi has been around for over 75 years, so we have a lot of experience and a reputation for quality. • Our prices are competitive, giving you great value for reliable parts. FixParts Online – Your Trusted Source for Quality Febi Auto Parts.