2006 Honda TRX680 Rincon Factory Service Manual, Page 180Get this manual
COOLING SYSTEM REPLACEMENTAIR BLEEDING NOTE: When filling the system with coolant, place the vehicle on flat, level surfaceRemove the steering cover (page 3-5)The engine must be cool before removing the radiator cap, or severe scalding may result
Drain the coolant from the system by removing the drain bolt and sealing washer on the water pump, and the radiator capReinstall the drain bolt with new sealing washer securely
DRAIN BOLT AND WASHER Disconnect the siphon hose from the reserve tank and drain the reserve coolantEmpty the coolant, remove the reserve tank cap and rinse the inside of the reserve tank with waterReconnect the siphon hose