12. COOLING SYSTEM MXU 300/250 COOLANT REPLACEMENT PREPARATION The effectiveness of coolant decreases with the accumulation of rust or if there is a change in the mixing proportion during usage. Therefore, for best performance change the coolant regularly as specified in the maintenance schedule. Mix only distilled, low mineral water with the antifreeze. Mix only distilled, low mineral water with the antifreeze. Recommended mixture: 1:1 (Distilled water and antifreeze) Radiator Cap Coolant Drain Bolt REPLACEMENT/AIR BLEEDING When filling the system or reserve tank with coolant (checking the coolant level), place the vehicle in a vertical position on a flat, level surface. Remove the radiator cap. Remove the drain bolt and drain the coolant from the system. 12-7