2-56Closed 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.Notice: To ensure we are always mindful of our environment; it is anIndmar and Malibu Boat recommendation to use Sierra Brandantifreeze because of its propylene glycol formulation. SIERRAAntifreeze is less toxic and safer than ethylene glycol coolantsto children, pets and wildlife, in case of spills, leaks, boil-overor careless disposal.The engine must be cool when checking the coolant level. Hotcoolant and steam under pressure may cause injury.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 2-42. 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.Malibu offers gray boat covers for which the Limited Warranty is administered by theirmanufacturer. No other color is offered by Malibu, and if another color is used, the cover andupholstery warranty will be voided.Figure 2-43. Boat Cover