Ford Tauras No heat Flush Bypass? troubleshooting 2003

What bypass are they talking about Flush heater core . On this car there is a bypass that goes past the heater core. If flushing the heater core or checking hose temperature to see if coolant is flowing you will need to disable the bypass. It seems a common thing for the heater core to plug up in the ford tauras . To replace the Ford Tauras heater core you must remove most of the dash. Car repair , 2003 ford. Coolant flush. Plugged heater core.