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How do you determine which heater hose is the inlet hose?

1. Follow the hose from the thermostat until you reach the water pump.

2. The water pump only discharges water from one side so the hose that is attached this is the inlet hose.

3. This is the hose will usually be attached to a tube which discharges the water into the top or side of the engine block.

4. The discharge hose, on the other hand, will be attached to a tube that discharges water from somewhere along the bottom portion of the engine.