Mando is a major supplier to the Hyundai Group - they originally made rotating electrical via Mitsubishi license, just like KEFICO basically cloned Mitsu's EFI systems for Hyundai. Wiki says Halla owned Mando - Halla also bought out Visteon's climate control business, which would explain why Ford and Hyundai AC compressors and controls look and behave alike.
Hyundai now has its own in-house suppliers(Hyundai Mobis/WIA/Powertech). They're like the Korean Delphi.
Why would Mando sell fluids, I dunno. Kinda like how Pentius started from the ashes of Daewoo USA.