24. SERVICE PROCEDURE 24.2 WHEN REQUIRED 24.2.1 CLEAN INSIDE OF COOLING SYSTEM ¤ WARNING Soon after the engine has been stopped, the coolant is hot and can cause personal injury. Allow the engine to cool before draining water. Never be under the machine with the engine running. To avoid serious injury, always stop the engine before being under the machine to open the drain valve. Never remove the radiator cap when the engine is at operat- ing temperature. At operating temperature, the coolant is under pressure. Steam blowing up from the radiator could cause personal injury. Allow the engine to cool until the radiator filler cap is cool enough to touch with your hand.
Remove the filler cap slowly to relieve pressure. When removing drain plug, avoid pouring coolant on your- self. Antifreeze is flammable, so keep it away from any flame. Clean the inside of the cooling system, change the coolant and replace the corrosion resistor according to the table below.
3-23 Kind of coolant Cleaning inside of cooling system and changing coolant Replacing corrosion resistor Permanent type antifreeze (All season type) Every year (autumn) or every 2000 hours whichever comes first Every 1000 hours and when cleaning the inside of the cooling system and when changing coolant Non permanent type antifreeze containing ethylene glycol (Winter, one season type) Every 6 months (spring, autumn) (Drain antifreeze in spring, add antifreeze in autumn) When not using antifreeze Every 6 months or every 1000 hours whichever comes first