in know its been a few months now since this thread..I had that same problem. Mine wasn't clogged, the drain is two parts and when the truck was built they were'nt sealed and seated properly. I bought my truck used and by the time I saw the issue under the floor mat the waranty expired. Go figure. Take it to a good mechanic and have him re-seal it. My truck went through three before the mechanic I now use got it, and it took him two shots. The bill was over $500.00 because the whole dash has to come out and the A/C needs to be pumped down. It took him 6 hrs to get the work done but he got it and it works perfectly. I hope I helped. Good luck.