Hey guys,

Maybe the wise members of acurazine could give me some feedback on this annoying little issue.

Recently I noticed that if I switch HVAC to re circulation mode there is a low frequency constant hum coming from the passenger side. This only occurs in air recirculation mode and nothing else. Switching between feet, vent, and windshield makes no difference.

Anyone have any ideas?

 

Check the recirc motor, it might be getting stuck. Though, I believe thats located on the driver side of the blower unit.