This thread http://www.bonnevilleclub.com/forum/...b12cbc17b1beb5
and a couple others helped me a lot. I had a fan noise that was driving me crazy. I was about to take it to the dealer, and thought I'd check here first.

I pulled the cover off under the hood (no cabin filter).
You can barely see the squirrel cage of the fan. It looked OK, and I couldn't get my hand all the way in there to feel the whole fan. I can just touch it with my finger tips. With a flashlight I could just see something in there. I ended up using a "claw" thing to reach in and clean out several leaves, parts of leaves, and a couple pine needles. That seems to have taken care of the noise.

I went to Murray'* and Autozone to find a Fram filter as suggested on another thread, but all they had were Bosch brand without the "frame"... they could order a Fram CF8804 for about $50. I finally ordered a Fram from PartsAmerica for $30:
http://www.partsamerica.com/ProductD...tnumber=CF8804
Ordering a few more items gets you free shipping.

Hopefully the filter will keep stuff out of the fan.
For those interested, here'* a couple pictures:
Cabin Filter Access in front of passenger wiper.
Close-up of Fan and that'* about all you'll be able to see. Someone suggested using a mirror to see better, and that sounds like a good idea.

I looked in glove box, but I can't imagine how anything could get sucked out of there. It'* sealed up pretty good. I hardly use the recirculate on the HVAC...
Does anyone know more specifically where the recirculate opening is?

The actuator is accessed after removal of the right sound insulator and removal of the Dash Integration Module (DIM) under the glove box. So the recirc. actuator door must be within close proximity.

It'* so nice and quiet (relatively speaking), so I'm not going to do much hunting. I never gave much thought to stuff getting getting sucked up there.

same here, about twice a year i get a scrap in there, i just pull it out and go on with life

Thanks alot for the information regarding the FRAM Cabin Filter. Perfect timing as I just went to check my cabin filter about a month ago to find there was no cabin filter. I thought they were standard on the GXP. I then found that I would need a "tray" while looking at replacement filters as well. So I went to the dealer and found that they sell the tray and filter as a package for a whopping $100. I decided I should make sure there were no other options but have not had time to check into it until now. So your information was right on time. Thanks again!

The Fram CF8804 is your best bet, and PartsAmerica is a reasonable price at $30.

Glad I could help!
Some of my order came in, but still waiting for the cabin filter. Must be all the Xmas shipments.

The filter came in today, and surprise! It'* a charcoal filter!
The yellow arrow on the front of the box says something about it.
Nice looking filter and frame for $30.
It'* raining. i'll try to fit later.

It takes a little finesse' & perseverance installing the filter, you'll see. : )

You were right! It looks impossible, but it will go in there.

My wife pulled her car out of the garage, so I snuck in there (still raining here in MI).
I took some pictures and I'll go thru it step by step.

Installing the Fram CF8804 Cabin Filter in 2005 Bonneville.
Here is the Filter as purchased from PartsAmerica.com for $30. It appears that the Fram filter is now charcoal activated.
Here are the Fram instructions. (Not a lot of detail, I'm afraid)

Open Hood.
Remove cabin filter cover (just in front of the passenger side wiper blade).
Remove old filter if present (I didn't have one).
You can just see the Fan . This is a good time to reach in and clear out any leaves or paper that may have gotten sucked into the fan.
The filter will be installed in this direction .
This Picture shows the passsenger side lock pin and driver side hole.
The filter will slide in pretty easy, until the thickest part of the filter is in the hole. Here you will have to Push towards the passenger side of the car, depress the lock pin a little, and give it the final push.
When fully installed , the lock pin will be snapped into the passenger side hole and the driver'* side holes will be lined up.
I read at another thread, that the driver side holes are a good place to slip in a zip tie to hold it down. Here is a before and after picture with a tie in the driver side holes.
Reinstall cover.
Close hood.
(Mumble to self... "that wasn't too bad".)

Good Luck to all that try.

As a side note, there is text on the side of the filter that shows the direction of air flow. It seems to me that the direction is wrong. Air Flow Picture. Any other opinions?