Originally Posted by oldscholevo

do you have the temp knob all the way on the cool side? you know the one that is below the blue dot? if you have the knob on the whit dot (I think) the vent will go to recirculate mode every time when you star the car. I have the same noize when I install the gage, I accidentally put the knob on the whit dot. which is full cool. and eveytime I turn the key to acc or on position it will make the same noize you are talking about.