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The heater core may be plugged. With the engine running and fully warmed up, feel both of the heater hoses with your hands. If one hose is hot and the other is luke warm or cold, the heater is plugged in which case you can try flushing the heater core. If both hoses are hot, the temp blend door acuator behind the dash assembly is broken. If both hoses are cold, replace the thermostat again and be sure the cooling system is full.

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Q: You cant the heater on your 03 s-10 to get hot you have changed the core thermostat d water pump What is next?
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