I have almost the exact identical problem. Tried 3 different IACs did everything you've done and is still howling.
Description: As soon as the car is started the noise starts and then after about 30 seconds it will tone down. I notice when im driving around 5 mph and slowly press on the gas pedal it will go away and then reoccur once I get to 20 + mph. I'm stumped, my mechanics are stumped! Is there anyone out there that has an idea of what this may be?
Sunday, October 7th, 2012 AT 7:48 AM