I will assume that is in an automobile. A bypass hose goes around the thermostat in your cooling system to allow some coolant to flow whenever the engine is running.
This prevents to much pressure to be built up in the system, allows for even cooling at start up and even gives you a slight amount of heat when you start the engine. Your heater core is often part of the bypass system in a car.
When the engine's thermometer opens the flow of coolant in the car increases this cooling the engine. As the engine cools the thermostat closes slightly and increases the flow through the core and bypass hose.
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You don't need to know what hose is which just take them both off and run a pipe from one to the other. You can but bypass kits at the parts store. GoodluckJoe
This is just another coolant hose, they fail because:The bypass is usually in a spot that gets oil leaks and this will cause it to fail earlyAll cooling hoses get old and tired
It's a quintuple bypass. My dad had a quintuple bypass in September 2010. Coronary artery bypass surgery, also coronary artery bypass graft CABG 'pronounced cabbage'. 1 - Single bypass 2 - Double bypass 3 - Triple bypass 4 - Quadruple bypass 5 - Quintuple bypass 6 - Sextuple bypass
a PVC hose is a hose connected to the back of the intake manifold to the front of the engine
Loosen the clamps and carefully twist the hose where it connects to the heater core. If you are wanting to bypass the heater core, just run one of the hoses between the two places on the motor where they connect or put a short piece of pipe between the two hoses.