What is the coolant bypass hose for?

A fifth hose, called the bypass hose, is used to circulate the coolant through the engine, bypassing the radiator, when the thermostat is closed. Some engines do not use a rubber hose. Instead, they might use a metal tube or have a built-in passage in the front housing.Click to see full answer. In this way, how do you replace a coolant bypass hose? How to Replace a Coolant Bypass Hose Jack up the front of the car and lower it onto jack stands below the two front tires. Place a drain pan under the radiator drain valve. Use a screwdriver to loosen the bypass hose clamps and remove the hose. Install a new hose and tighten the clamps. One may also ask, how long does it take antifreeze to circulate? As you are running the car, the engine starts to get hotter, the coolant which is pumped around the engine starts to heat up. The needle on the gauge starts to rise. Depending on how cold it is outside, it takes 2-10 minutes to get the needle directly in the middle of the C and H. Then, what is a coolant bypass? The heater bypass tube is a cooling system component found on many road going cars and trucks. The coolant bypass tube provides a passage for minimum coolant flow, so that the engine does not overheat from insufficient cooling when the thermostat is closed and restricting coolant flow.What checks can be made cooling system hoses and connection? Check the Hoses and Connections Visually examine the radiator and heater hoses for cracks and “swelling.” Squeeze them. If they collapse easily or if you see cracking or swelling, then it’s time for a replacement. While you are checking the hoses, pay attention to where the hoses connect to the engine and the radiator.