Honda Car engines GX640 Owner's Manual page 12

COOLANT
If there is no coolant in the reserve tank, check the cooling system for leaks and
repair if necessary.
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.
Add coolant to the radiator and the reserve tank, then check the coolant level in the
reserve tank after the engine reaches operating temperature. When the engine is at
operating temperature, the coolant level should be between the MIN and MAX
marks on the reserve tank. If the level is near the MIN mark, add coolant to bring it
up to the MAX mark.
Coolant Recommendation
Use high quality ethylene glycol antifreeze that is specifically formulated for use in
aluminum engines. Mix the antifreeze with low-mineral drinking water or distilled
water.
A 50/50 mixture of ethylene glycol antifreeze and water is recommended for most
temperatures and provides good corrosion protection. A higher concentration of
antifreeze decreases cooling efficiency and is recommended only if additional
protection against freezing is needed. A concentration of less than 40% antifreeze
will not provide proper corrosion protection.
l-izz-l
The use of unsuitable antifreeze, hard water, or salt water may cause corrosion
damage that will shorten the life of the engine.
MAX
CAP
COOLANT
(LOWER LIMIT)
11