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Heater Core - Plugged
Climate Control System
Heater Core - Plugged
1. Check to see that the engine coolant is at the correct level.
2. Start the engine and turn on the heater.
3. When the engine coolant reaches operating temperature, feel the heater core inlet and outlet hoses to see if they are hot.
4. If the outlet only is not hot:
- the heater core may have an air pocket.
- the heater core may be plugged.
5. If the inlet only is not hot:
- the thermostat may not be working correctly.