NOT SURE WHATS WRONG OR WHATS MISSING. MY 82 BLAZER IS LEAKING ANY RAIN THAT FALLS IN THE VENT STRAIGHT THROUGH TO THE INSIDE OF THE CAB.WHATS SUPPOSE TO STOP THIS,NOTHING SEEMS TO BE MISSING OR DAMAGED,BUT ITS JUST AN OPEN SHOT TO THE VENT DOOR IN THE KICK PANEL.THANKS IN ADVANCE FOR ANY HELP.