APRILIA ETV mille, Workshop Manual, Page: 146 / 352

ETV mille
COOLING SYSTEM
5 - 3 -
00
Release 00/2004 - 04
5.1 DESCRIPTION
An engine-driven centrifugal pump accommodated in the
engine circulates coolant through the system. The pump
takes in the coolant and directs it through the ducts into
the cylinders and cylinder heads to cool down engine
internals.
At engine outlet end, coolant is directed through different
routes depending on engine temperature. When coolant expands from heat, the expansion
reservoir takes up excess coolant.
≈ LOW ∆ and ≈ FULL ∆ level marks facilitate coolant level
inspection and top-up, see 2.13 (CHECKING AND TOP-
PING UP COOLANT LEVEL).
See 1.2.5 (COOLANT) for more details on coolant.
Key
1) Front cylinder thermistor
2) Rear cylinder thermistor
3) Breather tube
4) Balance tubing
5) Cooling fan
6) Filler cap
7) Engine to thermal expansion valve pipe (on right-
hand side of engine)
8) Cylinder pipe √ three-way manifold
9) Centrifugal pump
10) Expansion reservoir
11) Three-way thermal expansion valve (heat-sensitive
wax pellet type)
12) Thermal expansion valve coupling to radiator
13) Radiator coupling to thermal expansion valve
= Coolant flows in this direction when
thermal expansion valve is open
= Coolant flows in this direction when
thermal expansion valve is closed
3
1
2
4
6
11
10
8
12
9
7
13
5