I just replaced the heater core,blend door and blend door actuator in my 2002 f-150 and when I went to put the floor duct back in I noticed a vacuum line that had been accidently knocked loose from somewhere. When I operate the selector switch I can't get it to go from defrost to floor so I am sure it needs to be connected. Anyone have an idea where I should look? Thanks

 

Did it come off of the selector switch on the dash?

 

It came off the vacuum motor moves the Def/Panel/Floor door inside the plenum chamber. If that vacuum motor doesn't have vacuum, all airflow defaults to the defroster.

I forget which side it's on, you''l have to look. View straight up from the gas pedal and, if needed, the other side through the dropped glove box.

It's going to look something like this picture.

 

Thanks for the info. I got out my inspection camera and was able to take a look at the back side of the actuator that is barely visible in my picture and found the connection. I have it back on and everything is working again.