I've not seen or heard of a Metropolitan or Ruckus overheating, but still suggest owners check and clean (if needed) the radiator fins.
There are four screws, the cover snaps off - look around wiggle it, it will come off after the screws are removed.
Use a lot of caution in cleaning the fins, they bend easily and that will block air flow. You can vacuum them off or blow them out from the back - there are a couple holes you can spray high pressure air into.
Again, be careful, don't go jamming anything in or around the radiator, it can be damaged.
Here is ours -
Just take a look, you will be able to easily tell if it needs to be cleaned.
Thank you