Sometimes when I'm traveling at about 40 - 60 mph an obnoxious fluttering starts in the ventilation system when I have the AC or the Heater on with the fan on. Finally it gets on your nerves. A mechanic advised me that it sounds like a leaf or piece of trash had gotten down on top of the ventilation fan and the fan would have to be taken out, the trash removed and then replaced. A new plastic seal would be required. I need a good mechanic in this area that want charge an old retired man an arm and a leg.
Have piece of trash in ventilation fan. How much to take fan out and remove it? on 2006 Chevrolet Malibu
the labor is 1.2 hours.
1 more answer , 1 more comment
You could try to remove the cowl vent and block off all cabin vents but one and use a vacumm to suck it back out. I did this on my own pickup truck!
thanks, I might give that a try.