My rear sunshade is going out. I have noticed a slow deteriation over the summer where it was most helpful. It is not stuck and I was last able to get it down. However, It tries to go up but simply does not have the oomph. (let's leave the "viagra" recommendations out of this, please.!!!) Does this work off a vacuum and would the slow deteriation point to a leak or another remedy?
thx in advance.