Bypass Hose

The bypass hose circulates the coolant through the engine when the thermostat is closed. Since the coolant is constantly flowing through the hose, it can wear out over time causing the rubber to crack or split near the ends. Check the area usually near the top of the engine where the bypass hose is connected. If you notice coolant leaking from around the hose, or splitting on the hose itself, it should be replaced. O'Reilly Auto Parts carries a variety of cooling system parts, like bypass hoses, for most vehicles. Take a look at our selection and find the right replacement bypass hose for your car, truck, or SUV.