Acura 2009 TSX - Manual (Page 429)

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If the reserve tank is completely
empty, you should also check the
coolant level in the radiator.
If the coolant level in the reserve
tank is at or below the MIN line, add
coolant to bring it up to the MAX line.
Inspect the cooling system for leaks.
Always use Honda Long-Life
Antifreeze/Coolant Type 2. This
coolant is pre-mixed with 50 %
antifreeze and 50 % water. Never add
straight antifreeze or plain water.
If Honda antifreeze/coolant is not
available, you may use another
major-brand non-silicate coolant as a
temporary replacement. Make sure it
is a high-quality coolant
recommended for aluminum engines.
Continued use of any non-Honda
coolant can result in corrosion,
causing the cooling system to
malfunction or fail. Have the cooling
system flushed and refilled with
Honda antifreeze/coolant as soon as
possible. Adding Engine Coolant
Engine Coolant
Ma
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423
RESERVE TANK
Removing the radiator cap
while the engine is hot can
cause the coolant to spray out,
seriously scalding you.
Always let the engine and
radiator cool down before
removing the radiator cap.
If you regularly drive your vehicle
under severe conditions in very low
temperature (under
31°F, 35°C), a
higher concentration of coolant should
be used. Consult your Acura dealer f or
more inf ormation of the proper coolant.