Oliver 1850 and 2008 Impala

I put the Bush Hog on the 1850 and mowed roadsides and waterways in the field. Then I drove about 3 miles to the local cemetery and mowed the roadside next to it. They had mowed and not up close to the stones, so wife and I went back and I weedeated around stones and we put flowers by my Grandparents graves. OK, that should cover the tractor part of the post.
When we got home, I pulled the pickup into the carport next to our 2008 Impala. We got out and the car started making a tapping sound, kinda like a little kid hammering on a pound a peg. Wife got into the car and said it's coming from the dash. I got in on the passenger side and put my hand on the dash, it was coming from behind the dash above the glove box. It lasted about 45 seconds to a minute and quit. I looked in the glove box to see if my wife had a midgit hid in there, but it was just full of papers. Then it started tapping again, lasted about the same length of time and quit. It did it 3 times while we were standing there. I've never heard it do that before. Wife had driven it today, but it had set for 2 1/2 or 3 hours before we heard the noise. Any idea what it could be?? I'm wondering if the air bag is getting ready to explode, don't know what else it could be. Any ideas?? Thanks, Chris

Could be something caught in the air vent

you need a electric motor that opens and closes door in housing I have replaced more on outside air door. Pull glove box and find out which one it is.

You google recirculation door motor noise for your particular model... Are your issue Its a common issue...

Some are EZ to change out and some are a bear...

As I become a old man I have come to dislike anything to do with dash work :evil:

Thanks, for the reply's. I never thought of that. I have to agree with Hobo, I hate anything to do with dashes. It requires you to get into positions my old body won't bend to anymore and then with my bifocals, I can see it after I'm in position. Thanks again, Chris