mass air flow sensor (
arrow
) into
retaining clips in air filter upper
housing.
Cooling system service
Routine cooling system maintenance
consists of maintaining the coolant
level and inspecting hoses. Because
the coolant's anti-corrosion and
anti-freeze additives gradually lose
their effectiveness, replacement of the
coolant every four years is
recommended.
CAUTION!
Use only BMW approved
phosphate-free anti-freeze when
filling the cooling system. Use of
anti-freeze containing phosphates is
considered to be harmful to the
cooling system.
The float in the radiator tank indicates
coolant level, and should be inspected
while the coolant is cold. When the
upper mark on the float is level with the
top of the filler neck, coolant is at the
minimum allowable level. When the
lower mark on the float is level with the
top of the filler neck, the coolant is at
the maximum level.
Hose connections should be tight and
dry. Coolant seepage indicates either
that the hose clamp is loose, that the
hose is damaged, or that the
connection is dirty or corroded. Dried
coolant has a chalky appearance.
Hoses should be firm and springy.
Replace any hose that is cracked, that
has become soft and limp, or has been
contaminated by oil.
As a preventive measure, replacement
of the cooling system hoses every four
years is also recommended. The
Maintenance
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Summary of Contents for 1999-2005 M3
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