2019 Malibu Boats, LLC Owner’s Manual • Page 107
attempt to inspect or repair components of the cooling
system. Most are inaccessible. All can be inadvertently
damaged if not properly accessed, often necessitating
specialized tools. Attempting unauthorized inspection or
repair can void the warranty.
Coolant Requirements
In the closed cooling system, verify that there is sufficient coolant/
water in the system. (Coolant and water may be required to be mixed,
depending on the brand of coolant, most likely in a 50/50 mix.) Because
a closed cooling system retains and recirculates coolant an additional
step prior to every outing is necessary: Before starting the engine, while
it is still cool to the touch and does not burn skin, check the coolant
reservoir level. The instructions for this critical step are explained in the
Care and Maintenance
section of this Owner’s Manual.
Use only a mix of 50/50
marine-grade propylene
glycol antifreeze and distilled
water in a Malibu engine closed cooling system. (Premixed
coolant is commercially available, but when manually
mixing use only marine-grade propylene glycol antifreeze
mixed with 50 percent distilled water.) The use of any
other type of coolant and/or water can void the warranty.
NEVER use ethylene glycol
or Dex-Cool antifreeze
coolant. These types of
coolants are not formulated for the requirements of the
Malibu Monsoon engine. NEVER mix the approved
propylene glycol coolant with any other type of coolant,
including ethylene glycol or Dex-Cool, even in small
amounts. In fact, these different formulations do NOT mix
and will not provide the required cooling protection for
the Malibu Monsoon engine.
Malibu recommends using Sierra Brand, 5-Year, 100,000-mile
Marine Grade Coolant in a 50/50 mix with distilled water to keep the
warranty in effect. Sierra is an environmentally friendly coolant.
While some evaporation occurs naturally, it should not occur at
an accelerated rate. If a closed cooling tank has significantly lost
coolant, especially if it is nearly empty, a potentially serious issue
exists. Present the boat to an authorized Malibu dealer for analysis
and correction, prior to starting the engine.
Coolant should be flushed
from the system and fully
replaced every two years, and
the cooling system carefully
checked for any leaks.
The Exhaust System
Always operate the blower for several minutes (at least four
[4] minutes) prior to starting
the engine, running at a low
speed or at idle. (Malibu
boats are equipped with an
automatic shut-off when the automatic blower system has
operated prior to starting the engine.) This must be done
with the engine compartment open. Failure to perform
this necessary function could result in an explosion of the
accumulated fumes within the compartment, resulting in
serious injury or death.
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