When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I remember when purchasing a similar evacuator for my mother-in-law's Mercedes that they specifically mentioned that it did not work for the C5. I'm guessing that there is likely a baffle which is preventing the hose from being inserted all of the way.