You could leave it alone, but you will lose that safety feature for the a/c system. I would just strip down the insulation on the wires and twist them together (solder if you want), until you can do a more permanent fix. Cover the connection with electrical tape.
There are kits you can order on Amazon and elsewhere with assorted wire connectors. Maybe someone here will know if the blade-type connectors are still available through Mercedes Benz. If so, I would also be interested in ordering some.