2008 Polaris Sportsman 500 EFI/X2/Touring/500 H.O. Service Manual, Page 67Get this manual
ENGINE Cooling System WARNING
Never remove radiator cap when engine is warm or hotThe cooling system is under pressure and serious burns may resultAllow the engine and cooling system to cool before servicingSystem Pressure Test 123Remove radiator cap cover located in storage boxRemove recovery bottle hose from coolant fillerConnect Mity VacTM (PN 2870975) to radiator and pressurize system to 10 PSI (68.9 kpa)The system must retain 10 lbs of pressure for five minutes or longerIf pressure loss is evident within five minutes, check radiator, all cooling system hoses and clamps, or water pump sealRemove radiator cap and test using cap tester (commercially available)The radiator cap relief pressure is 13 lbs (89.6 kpa)