2008 Yamaha Rhino YXR70FX Factory Service Manual, Page 269Get this manual
OIL COOLER
CHECKING THE OIL COOLER 1Check: oil cooler Obstruction CleanApply compressed air to the rear of the oil coolerDamage Repair or replace the oil coolerTIP: Straighten any flattened fins with thin, flathead screwdriver2Check: oil hoses Cracksdamage Replace