Question about Toyota Avalon

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2006 Toyota Avalon XLS moonroof rattle above front passenger seat near front corner of moon roof. This just started in the last year or so. It seems to come from actual metal expansion or contraction, because it is less noticeable in warm weather or when the car is very warm from running or sitting in the sun. When press on moonroof frame in the front corner over passenger, rattle becomes less noticeable. Have had Toyota dealer examine car. I even gave them a Toyota technical services bulletin I found dealing with issue but they found a satellite antenna wire which was loose. They attached that with a clip for $100 which did nothing for the rattle. The technical services bulletin deals with using a foam insullation kit of some sort to try to stop this problem reported by several Avalon owners. This is evidently very labor intensive - so big bucks. Dealer actually thought they were saving me money by attaching the satellite antenna which as I said did nothing to stop the rattle. The rattle is very annoying but there is a cost benefit issue so do not want to spend more hundreds of dollars for something that may or may not work. Wonder if canned foam somehow blown into the headliner in that area might help or just runin the headliner - big bumps in headliner. Any advice?? Think I will never buy another Toyota given all their issues recently and now this -- rattles in a car advertised as being very quiet!

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  • sr_brumley Apr 01, 2011

    Thanks for the prompt advice --

    Question -- does this mean the entire headliner needs to be removed to do this or is this something done from outside once the moonroof is opened. I am not sure from your description if I should attempt this myself. If it involves removing the entier headliner to access the area then probably not. On the other hand if I can reach areas from outside the car, then may try it myself.

    As to the foam under the hood -- what is the hood? Is that the part that pops up in front of the moonroof when the moonroof is opened. Are you talking about the canned expanding type foam. I think there is some also available that does not expand that might be safer for a novice like me to attempt to use.

  • sr_brumley Apr 01, 2011

    Thanks - my question was mainly if the headliner needs to be removed in which case I don't think I would attempt this. If you answered that I missed it. I guess I need to go back to dealer or garage - did not understand your terminology either - "the bone"?? - is that the frame around the interior of the moon roof? And your asterisk **** means what ? the liner? If I go back to a garage, I will show your emails to a garage and hopefully they can figure it out.



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Yeah the problem comes from the metal expansion as you have rightly thought. When its hot the metal expands allowing the seal to hold propperly, when its cold and it shrinks, the metal contracts slackening the seal and it rattles, the problem will get worse and even start to leak..

To Fix this (which you will have to do every few years or so)

1.) open , remove the moon roof housing assembly to expose the rubber seal and bolts.
2.) enusre the bolts are tightened (I assure you some are loose)
3.) remove the seal and reseal it using ribbon sealer or the silicon gasket maker.
4.) use a can of foam and spray in the open areas (inside the hood) Where it wont be seen.
5.) let dry reassemble.

Ps the less you use it the better off you are.

If you'r not sure what your doing, take the car to a garage and inform them about the fix.

Posted on Apr 01, 2011

  • Rishi Roshan Ali Apr 01, 2011

    Its 2 seals, the bone between the moon roof and the liner, and the liner and the vehicle
    Yes can foam, you see between the liner and moonroof and **** and cars body, the open spacs inbetween, the metal ?? the foam goes in there to prevent the metal from hitting against one another (thats whats causing your rattle)

    It can be a tedious task if your unsure about it have a garage do it, that way they have to pay if they mess up.

  • Rishi Roshan Ali Apr 01, 2011

    Sorry about that,, Ok by bone i mean the part round the head liner where the moon roof fits in. Yes the whole thing has to come out. THE ENTIRE assembly. Headliner and all.



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