2004-2005 660 Yamaha Rhino Factory Service Manual, Page 98Get this manual
CHANGING THE COOLANT CAUTION:
Adding water instead of coolant lowers the antifreeze content of the coolantIf water is used instead of coolant, check, and if necessary, correct the antifreeze concentration of the coolant Use only distilled waterHowever, soft water may be used if distilled water is not available If coolant comes into contact with painted surfaces, immediately wash them with water Do not mix different types of antifreeze17.Install: air bleed bolt 18.Install: radiator cap