The rear wiper blade on my 2012 Routan is not making good contact with the glass. It turns on and acts like it's wiping, but doesn't actually clear the glass. I have tried four or five different brands/styles of wiper blade and none of them make any difference. It's like there is no wiper blade at all. If I push the blade down towards the glass with my hand while it is wiping, it makes stronger contact and clears the glass.
Any ideas on what the fix is? Is the spring in the wiper arm supposed to be pushing the blade towards the glass? It doesn't seem to offer much resistance when I pull up on the arm. Maybe I need to replace it?