I already looked in the wheel well, I can't see any exit point on the real wheel well. Where in the wheel well is the exit point? How do you suggest to clear it, with a wire as a snake? Do I need to remove the rear wheel to get access to it? Can I spray a burst of water thru a garden hose or do I need compressed air.
Are those clips going to be reusable once they are removed or will I need to buy new ones.
Once I blow air up thru the drainage hose, whatever debris is there will fly up back into the rear of the gutter system of the window only to wash back down when water flows back in and washes it back. Because the moonroof doesn't allow me acces to the rear of that gutter system. Any suggestions on how to clear that area so what I blow out doesn't go right back in when it rains?
The only way to gain access to the rear drain tubes from the sunroof side is to drop the headliner.Pouring water into the drain trough on the sunroof will be sufficient to clean out the drain tubes once wire is run up through them.Dropping the headliner is a big job.The front drain tubes drain out between the front door hinges.Here is the service procedure from the CTS manual.
Important: If the headliner is wet DO NOT remove any interior trim. Do the Plugged Drain Hose test first.
A drain trough encircles the sunroof window panel and water is drained off by the drain hoses located at each corner of the housing. A drain channel spans across the sunroof module at the rear of the window panel and directs water into the trough.
If a water leak has occurred check for a plugged drain hose at each corner of drainage system.
Caution: Wear safety glasses in order to avoid eye damage.