I had a misfiring ignition coil replaced. The mechanic who replaced it pointed out that there was an odd leak in the windshield cowling. To see it, you would open the hood and pour some water on the windshield. When the water collects and funnels to the center of the cowl, water will leak under the seam of the 2-piece cowl and drip down the back of the engine to the ignition coil area. The mechanic pointed out that the resevoir where the misfiring coil was had a lot of water in it. I cannot seem to seal the cowl seam to prevent water from leaking into the engine area. Seems like a design defect for the 2005 Cadillac CTS designed cowl. Not sure if others have the same problem and know of a fix. Thank you,.