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.

1 Answer 1


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.


You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .