I have the typical "defrost only" situation right now that I've been troubleshooting. I went through the steps of replacing the vac line from the tree to the under dash diaphragm to no success. I then started pulling a vacuum on each line with a mightyvac off of the back of the switch and the yellow line that runs back to the blend door motor for the dash/defrost vent pulled no vacuum. So I would assume that that motor is bad correct? I also pulled a vacuum on the yellow line itself and it held just fine with my finger plugging one end off. With everything reconnected and the car running, I can pull the yellow line off of the vac motor and it has a decent suction to it. So bad vac motor correct? Next question, how do I replace it after I get a new vacuum motor?