Bleeding The Circuit - APRILIA Atlantic 500 Workshop Manual

Routine maintenance operations
• Start the engine and leave it running at minimum
running speed.
• Place a container under the engine to collect the
coolant that will spill out from the bleeder screw
(5).
CAUTION
The coolant is pressurized; loosen the bleeder
screw (5) slowly and a little at a time in order to
avoid splashing dangerous fluids.
• Loosen the bleeder screw (5) on the thermostatic
valve (6); let a small quantity of fluid flow out,
together with any air bubbles, then tighten the
bleeder screw (5).
• Check the level of the coolant in the expansion
tank (2) and top up to the "MAX" level (to bleed it,
see page 2-24 BLEEDING THE CIRCUIT).
• Run the engine for a few kilometers until it
reaches normal working temperature.
CAUTION
Switch off the engine and wait until both the
engine and the exhaust system are cool.
Follow these steps in reverse order to refit the plastic
parts.
CAUTION
If coolant is used up too quickly and the expan-
sion tank becomes empty, check for leaks in the
circuit.
Coolant is harmful: DO NOT DRINK.
KEEP OUT OF REACH OF CHILDREN.
CAUTION
Only use nitrite-free antifreeze and anticorrosive
products that guarantee protection to at least -31
°F (-35 °C).
For information about the cooling system, see (COOL-
ING SYSTEM).

BLEEDING THE CIRCUIT:

• Remove the front outer shield, see (REMOVING
THE FRONT OUTER SHIELD).
• Remove the filter box, see (REMOVING THE
FILTER CASE).
• Open the expansion tank cap.
• Remove the protective cap of the bleeder nipple,
situated on the union tee of the cylinder head (1).
2-24
Release 00 2002-09
6
5
2
chap. 2
Atlantic 500
3
1