Aeon 350cc, Service Manual

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ENGINE
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8. Add coolant to the radiator filler neck if the level goes
down.
Be sure to install the pressure cap before
shutting off the engine. Coolant may spit out
of the radiator.
9. Repeat 6 to 8 step. If no bubbles are seen at the filler neck,
the system should be purged of air.
10. Stop the engine and let cool, top off the radiator filler neck
with coolant. If you hear or see a “glug” at the filler neck, or
there is a dropping of the coolant level, indicating that coolant
has been pulled into the system; Fill the recovery bottle only
after you have completely filled the cooling system at the
radiator filler neck.
11. Repeat this procedure, if overheating still occurs.