2-57Closed Cooling SystemIf your boat is equipped with an optional closed cooling system, you will need to maintaincorrect fluid levels.• Open engine compartment and remove reservoir cap.• Ensure coolant is to the top of the reservoir filler neck.• Use Sierra Anti-Freeze.To ensure we are always mindful of our environment, MalibuBoats recommends the use of Sierra Brand antifreezebecause of its propylene glycol formulation. SIERRAAntifreeze is less toxic and safer than ethylene glycolcoolants to children, pets and wildlife, in case of spills, leaks,boil-over or careless disposal.The engine must be cool when checking the coolant level. Hotcoolant and steam under pressure may cause injury.For specific engine information including its warranty, refer tothe engine’s owner’s manual in the information packetshipped with your boat.Optional EquipmentHeaterIf your boat is equipped with a heater, you will find anON/OFF accessory switch located on the dash panel. Locatedat the base of the observer seat walkway is a snorkel tube thatcan be pulled out and directed wherever you like within afive-foot radius. Please refer to the information provided inyour owner’s packet for specific use.Figure 2-44. HeaterBoat CoverIf your boat is equipped with this option, know thetype of cover you are placing on your boat. SomeBoat Covers have been made strictly for mooringand storage only, and some have been made forstorage and travel. If you question the type of coverthat you have purchased, check with your Malibudealer for assistance. Do not cover the boat if theinterior is wet or damp. This can promote mildewgrowth.!CAUTIONFigure 2-45. Boat Cover