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Could be blend door issues. With engine warmed up, running and coolant level is full, open the hood and locate both heater hoses. Feel the hoses with your hands. If both hoses are hot you probably have a blend door problem. If one hose is hot and the other is only warm or cold you probably have a plugged up heater core, try flushing it. If both hoses are only warm you may have a faulty thermostat, replace it.

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Q: You have an 84 Cadillac De ville heat blows cold and ac is minimal think you have the same problem with blend door Any Suggestions Thanks?
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