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Coolant hose repair9/23/2023 ![]() There is an overflow hose between the coolant cap and the reservoir to store (and add) extra coolant. BMW’s V8 and V12 engines are one such example. There will be a dedicated pipe for coolant in this channel. Instead of using externally mounted tubes or hoses, some engines go a step further and use internal passages cast into the front casing of the engine for the return coolant to flow through. The bypass return line is usually short in length and is often considered the “fifth hose”.Īlthough uncommon, some engines (like the BMW V8) have their coolant bypass pipes placed in hard-to-reach places inside. The design of the coolant return unit varies by car manufacturer. It sounds like the bypass “tube” is a rigid, non-flexible tube made of steel or plastic, while the bypass “hose” is a traditional rubber compound hose. When this happens, the coolant flows through an externally mounted coolant bypass pipe or bypass hose. The thermostat remains closed until the engine coolant heats up after a cold start – directing the coolant back to the engine block instead of the radiator. Next, there are two smaller heater hoses that lead to and out of the heater core located under the dash, providing heat to the passenger compartment.Ĭoolant bypass pipe, shown in black as separation. This hose and the upper coolant hose are the largest of the cooling system hoses and both connect to the front of the engine block. This coolant is drawn by the engine’s water pump, and it releases most of the heat as it passes through the radiator. ![]() A lower coolant hose is attached to the bottom of the radiator. First, the upper coolant hose goes directly from the thermostat housing (on the intake manifold or cylinder head) to the top of the radiator. In a typical car cooling system you will find at least 4 main hoses. Opportune Times To Replace Coolant Hoses.Checking The Condition Of Your Cooling System Hoses. ![]()
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