Wow, never knew this was a problem. My 99 Grand Prix GTP rotted behind the rocker panels due to a similar situation. When I clean my truck this week I'm going to check out behind the wheel liners.
Thanks for the info!
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Reviving this thread since it's approaching that time of year again. Fall brings with it leaves, pine needles and other debris that may get down into the fender well area spoken about and pictured in Post #1 of this thread. It is an open path to this area and I thought about another possible proactive solution to remedy this.
I also have a lot of trees that drop small seeds in Spring and though I do not park my truck outside very much at all, there is the occasion where I maybe leave it in the driveway a few hours if I am leaving again later.
I had some of this 1.25" coarse pond filter media and seems like a good way to block even small seeds, and pine needles, yet allow water to drain through in the designed manner from the cowl area when it rains or going through a car wash.
This filter material is very coarse and almost see through as you can see in the picture below with the tape measure. It is also very "springy" and remains in place when inserted into the upper fender well cowl area. I cut a piece about 9" wide and 12" long for each fender screen. I then inserted it ( a bit tricky ) into the slot like opening between the inner fender sheet metal and the fender bracket bolt points. I also doubled over the top 3.5" to 4" or so of the filter screen material as I inserted it to provide added thickness and also wedge it snugly in place.
So far, it has accomplished what I wanted to keep debris out and it is easily removed for a quick wash or rinse with the hose if needed.
Anyway, a simple but effective remedy for those who may be interested. The Material is available from Aqua-Flow from several vendors. I found the material direct from Aqua-Flow on Ebay was the best price at under $20 for a 12" X 72" size. I originally purchased a larger quantity for our pond and the price I just quoted is listed for higher prices elsewhere.
https://www.ebay.com/itm/12-x-72-x-...486647?hash=item1c82611c77:g:85gAAOSwpkFY8GHc