Doesn't matter which way the water flows. The heater core is just a tube with fins and water can flow either direction.
rad hoses route coolant to the engine to maintain operating temperature (to keep engine from overheating). Heater hoses supply the heater core (inside most vehicles) with hot water, when heater/ac temperature control knob is turned toward hot, to heat the interior of the vehicle by opening and closing a water flow control valve allowing water to enter the heater core for heat. =;)
Remove both heater hoses from the engine, then fabricate a fitting to attach a garden hose to one of the heater hoses. Direct the remaining hose into a bucket then slowly turn on the water until the water runs clean. Then reverse the flow by switching the garden hose over to the other heater hose and repeat until the water runs clean. Then replace the hoses to the engine and refill the coolant reservoir.
With the vehicle warmed up and running feel both heater hoses with your hands. If one is hot and the other is luke warm or cold, the heater core needs to be flushed by itself. Flushing the whole system doesn't unclog the heater core. Disconnect both heater hoses from the engine, fabricate a fitting to attach a garden hose to one of the hoses. Direct the other hose into a container and gently turn on the water until the water runs clear, then reverse hoses and run again until clear. Reattach hoses to engine and refill reservoir.
I would disconnect both heater hoses from the engine, then fabricate a way to connect a garden hose to one of the hoses leading to the heater, then gently turn on water supply for a minute, then attach garden hose to opposite heater hose and flush again, then reattach both hoses to engine and top off coolant reservoir.
I disconnect both heater hose off of the engine, then fabricate a fitting that will attach a garden hose to one of the heater hoses. While directing the other hose towards a bucket, I gently turn on the water supply to wide open and let the water run until it shows clear, then reverse the flow into the heater by switching hoses and repeat.
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