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With the engine warmed up and running, open the hood and locate the two heater hoses. Feel the hoses one at a time. If one is hot and the other is not so hot or cool, you have a plugged heater core. Try flushing the heater core. If both hoses are hot, you probably have a failed temp blend door actuator.

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Q: Installed new thermostat and still have no heat for a 90' Chrysler New Yorker Landau 3.3L v6 engine could that be the heater control valve that's bad or something else?
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