GMC body leak test

I've seen others do a leak test by pressurizing the interior body and then using soap spray to find leaks. We have a windshield leak that happens when driving in rain. Hopefully now that I think I found it and sealed it it won't leak at least there.

   Craigslist furnace blower and 12" flex duct from a mobile home AC unit

      Bubbles from pass side window

                                        Think this is the one I was really after

                                            Lots of air coming out!