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I think the answer to this is easy but I'm not sure of the part name.

I'm driving along and have the heater on, but it's blowing cold air. Then I hear kind of a "clackety clack", and then the air becomes hot, and I can also see the gauge lowering on the engine temperature.

Seems there is some type of valve which is not opening when it should, but again I am not sure of its name or how to replace it. It sounds like it's under/behind the dashboard in the center area. Definitely NOT the engine thermostat, that's under the engine block and not coming from there.

FYI this is a Subaru Outback 2007 but I vaguely recall hearing this noise and situation in other car(s) before.

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It is most likely one of two things. The mode door which opens and closes as more or less heat is requested, is sticking. Or the actuator that opens it is faulty.

  • Thanks, now I have the terms to search for. – Oliver Williams Dec 4 '19 at 12:15

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