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I disconnected one heater hose at a time flow is good going to the heater core but return flow is weak. Do heater cores fail this way? It has usually been my experience that they develop a leak when they fail. Do they get stopped up? I have only had the truck for 9 months and have no idea how it was maintained before I got it(probably not well, it still had original PCV at 160k). I have replaced the thermostat and temp sensor because gauge didn't register.