Yamaha VK PROFESSIONAL-II 2016 Owner's Manual page 62

Periodic maintenance and adjustment
When the engine has cooled, place a thick
rag or towel over the radiator cap, and
slowly rotate the cap counterclockwise to
the detent. This procedure allows any re-
sidual pressure to escape. When the hiss-
ing sound has stopped, press down on the
cap while turning counterclockwise and
remove it.
1
1. Radiator cap
To check the coolant level
1. Place the snowmobile on a level surface
and apply the parking brake.
2. Open the shroud.
3. Check the coolant level in the coolant
reservoir when the engine is cold. If the
coolant level is below the "LOW" mark,
remove the coolant reservoir cap and
add coolant until it reaches the "FULL"
mark. (See the following section "Re-
plenishing the coolant" for more details.)
NOTICE: If coolant is not available,
use distilled water or soft tap water in-
stead. Do not use hard water or salt
water since it is harmful to the engine.
If water has been used instead of
coolant, replace it with coolant as
soon as possible, otherwise the cool-
ing system will not be protected
against frost and corrosion. If water
has been added to the coolant, have a
Yamaha dealer check the antifreeze
54
content of the coolant as soon as pos-
sible, otherwise the effectiveness of
the coolant will be reduced.
2
1. "FULL" mark
2. Coolant reservoir cap
4. Close the shroud.
Bleeding the cooling system
The cooling system must be bled if the cool-
ant reservoir becomes empty, if air can be
seen in the cooling system, or if there is a
cooling system leak. Consult a Yamaha deal-
er.
ECS00501
NOTICE
Operating the engine with an improperly
bled cooling system can cause overheat-
ing and severe engine damage.
Replenishing the coolant
1. Place the snowmobile on a level surface
and apply the parking brake.
2. Open the shroud.
3. Remove the coolant reservoir cap and
add coolant until it reaches the "FULL"
mark.
[ECS00493]
1