Filling/Bleeding Cooling System - Arctic Cat Sno Pro 120 Service Manual

4. Apply 5-8 psi to the coolant system through the cool-
ant overflow tube and continue until the coolant
stops draining from the system.
FILLING/BLEEDING COOLING
SYSTEM
1. Remove the left- and right-side access panels and
hood; then on the Bearcat/T-Series, remove the torx-
head screws securing the console.
 NOTE: On F/M/XF models, place the hood along
side the snowmobile; then using Hood Harness
Extension, connect the hood to the main harness.
2. On the Bearcat/T-Series, move the console up and
forward; then with the harness connected, securely
position the console on the snowmobile.
CAUTION
Use care not to allow the console harness to come
into contact with the exhaust pipe during this proce-
dure.
3. On Bearcat models, remove the headlight support
bracket/heat shield.
4. On the T-Series Turbo model, loosen the cap screws
securing the heat shield to the exhaust manifold/turbo-
charger; then using a deep socket and hammer, tap the
washers making sure that the washers are free from the
head of the cap screws. Remove the cap screws and
move the heat shield to access the bleed screw.
CAUTION
Make sure the washers are free from the heat shield
cap screws or damage to the heat shield will occur.
5. Loosen the bleed screw and add coolant into the
filler neck until coolant is visible at the bleed screw;
then tighten the bleed screw and add coolant to the
coolant reservoir Full-Cold line.
CAUTION
The cooling system must be properly filled. If the sys-
tem isn't properly filled, engine damage will occur.
3-16
SNO-728A
6. Start the engine and allow it to run for five minutes.
7. With the engine cool, loosen the bleed screw and
allow the coolant level in the filler neck to drop; then
with the bleed screw loose, add coolant into the filler
neck until no air is visible or heard at the bleed
screw. Tighten the bleed screw and add coolant to the
reservoir if necessary.
 NOTE: If the coolant level in the filler neck suddenly
drops when the bleed screw is loosened, an air-lock
occurred in the cylinder head. Add coolant to the
filler neck until full before starting the engine.
Running the engine with low coolant level can cause
severe engine damage.
8. Start the engine and allow it to run for five minutes;
then shut the engine off and allow it to cool.
9. Repeat steps 7-8 at least two more times (more if
necessary) until no air is in the cooling system.
Operating the snowmobile with air in the cooling sys-
tem will cause severe damage to the engine.
10. On the Bearcat models, install the headlight support
bracket/heat shield.
11. On the T-Series Turbo model, place the heat shield
into position and secure with the cap screws. Tighten
the cap screws to 96 in.-lb.
 NOTE: Apply a film of anti-seize to the threads of
the heat shield cap screws before installing.
12. On the Bearcat/T-Series, secure the console using the
existing torx-head screws and install the hood and
side panels.
13. On the F/M/XF, install the hood and both side pan-
els.
INSPECTING COOLANT HOSES AND
CLAMPS
All coolant hoses and connections should be checked
annually for deterioration, cracks, and wear.
All coolant hoses and clamps should be replaced every
four years.
CAUTION
CAUTION
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