These rear vent thingies

[LakesPuma]

I have read a lot of talk about the vents in the rear of the car and wonder if there is a way of testing them?

 

I do find that the doors will not close unless you shut them with some force, my old Mondeo used to close the doors with the lightest of touches.

[psycholist]

The easiest way to test them is to listen for the clap noise they make as they close a split second after you slam a door or especially the boot. 

[FelisBengalensis]

Could just be an adjustment issue.  Mine shut very easily.

[Dejay]

What vent thingies.....?