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I have a 351m motor and standard no a/c truck.
Does it matter how the heater uses from the motor to the heater core are run? Is there an inlet/outlet on the motor and heater core???
Really it doesn't matter. The core's going to get hot regardless of circulation direction.
Yup this ↑ In these trucks functionally it does not matter what direction coolant flows through the heater core. For optimal hose routing, it may make a difference where the feed and return hoses go.
