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Old 10-02-2012, 10:31 AM   #2
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Plugged is a possibility, but I'd try to flush it out in reverse order (apply water hose to outlet) instead of trying to push things through from the inlet side as your note describes.

Air in the system is a common cause of such issues with this type of system that has a coolant tank higher than the radiator with bleed hoses to the tank from high points in the cooling system's plumbing. They are SUPPOSED to flow just enough to bleed out any air, but being quite small they are MORE likely than your heater core to be plugged.

Check out all those small plastic lines - once clear your problem may be solved!

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