2004 John Deer Buck Utility ATV 500, 500EX and 500EXT Service Manual, Page 78Get this manual
To drain cooling system, unscrew plug under engine and remove the radiator cap no4 V01C3SA
V01c3sa3.EPS
When cooling system is drained completely, screw cooling drain plug and torque it to Nm (62 lb-in
V03C03A
V03c03a3.EPS
Unscrew bleeding screw on top of thermostat housing