August 9, 20178 yr I have this noise from the heater on my 3.0 2007 legacy. Play it loud and you will hear it. https://youtu.be/qlw3ubT2gz0 Edited August 9, 20178 yr by Starlite
August 9, 20178 yr Could be some debris in the heater-fan. Perhaps a dried leaf hitting the vanes of the fan-cage?
August 9, 20178 yr Author I dont think there is some debrie in the fan . This is something else and when i shut down the car i can hear some strange noise from the heater.
August 9, 20178 yr One of the mode control actuators is stripped. Could have some debris jammed in the flap that it controls or the flap could have just broken on its own. Common in a lot of American vehicles but haven't heard of it happening very often in Subarus. I can't give specifics on locations but you should be able to find it by looking/listening/feeling for the actuator to clunk. You can partly narrow it down by moving the blend controls and mode controls to see which mode makes it stop.
August 10, 20178 yr agree with @Fairtax. I have the same issue on my 05 OB. Try switching mode controls and you will hear that the noise will stop/change as you switch between modes. Mine is intermittent.
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