2008 Yamaha Rhino YXR70FX Factory Service Manual, Page 258Get this manual
RADIATOR AND COOLANT RESERVOIR
CHECKING THE RADIATOR 1Check: radiator fins Obstruction CleanApply compressed air to the rear of the radiatorDamage Repair or replaceTIP: Straighten any flattened fins with thin, flathead screwdriver2Check: radiator hoses Cracksdamage Replace
3Measure: radiator cap opening pressure Below the specified pressure Replace the radiator capRadiator cap opening pressure 93.3122.7 kPa (0.9331.227 kgcm2, 13.2717.45 psi)