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Plugged Heater Core

WARNING: This page is about a different car, the 2002 Mazda B4000, 2002 Mazda B3000, and 2002 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: The heater core inlet hose will become too hot to handle if the system is working correctly.
  1. Check to see that the engine coolant is at the proper level.
  2. Start the engine and turn on the heater.
  3. When the engine coolant reaches operating temperature, feel the heater core outlet hose to see if it is hot.
    • If it is not hot:
      • The heater core may have an air pocket
      • The heater core may be plugged
      • The thermostat is not working properly
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