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#1 Old 01-26-2013, 11:55 PM
Mike Sal
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diagnosing Poor Heater Performance

I can't get more than luke warm air from the heater duct. I've not had a chance to reverse flush the heater core to see if that would help. What steps or procedure should a guy follow to test if all of the blend doors are working properly before I go to the trouble to replace the heater core. Just looking up around the dash doesn't really reveal any of the vacuum motors to see if they are working properly or not.
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Mike Sal
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#2 Old 01-28-2013, 12:48 PM
dodgensince74
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before you replace your heater core do the reverse flush on it(quick, easy and cheap to do). check to see if your blend door motor is opening and closing the blend door( another freebie check).

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#3 Old 01-30-2013, 07:53 PM
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Is it cold where you are?. Here in the mtns. I cover half of the radiator core with a sheet of cardboard to slow the cooling effect of the winter cold air down to build some heat in the radiator and heater core. If not it takes a long time to warm the coolant all the way to the heater. If it is real cold the thermostat hardly opens and I never get much heat into the cabin. The radiator fan spinning all the time don't help either in the cold...

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