Hoses/Thermostat (650 V-Twin) - Arctic Cat 400 Service Manual

D. If the thermostat does not open, it must be
replaced.
3. Inspect all coolant hoses, connections, and
clamps for deterioration, cracks, and wear.
NOTE: All coolant hoses and clamps should be
replaced every four years or 4000 miles.
INSTALLING
1. Place the thermostat and O-ring into the thermo-
stat housing; then secure the thermostat housing
to the cylinder head with the two cap screws.
2. Install the crossover coolant hose onto the water
pump and engine water inlet. Secure with the
two hose clamps.
3. Slide the upper hose onto the thermostat housing
and radiator. Secure with the two hose clamps.
4. Install the lower coolant hose onto the water
pump housing and radiator. Secure with the two
hose clamps.
5. Fill the cooling system with the recommended
amount of antifreeze. Check for leakage.
Hoses/Thermostat
(650 V-Twin)
REMOVING
1. Remove the front rack and fenders; then remove
the center splash shield.
2. Drain the cooling system down approximately
one quart.
3. Remove the cap screws securing the thermostat
housing to the mounting bracket; then remove
the remaining two cap screws and separate the
housing and cover.
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4. Remove the thermostat and account for the seal.
INSPECTING
NOTE: Whenever a part is worn excessively,
cracked, or damaged in any way, replacement is
necessary.
1. Inspect the thermostat for corrosion, wear, or
spring damage.
2. Using the following procedure, inspect the ther-
mostat for proper operation.
A. Suspend the thermostat in a container filled
with water.
B. Heat the water and monitor the temperature
with a thermometer.
C. The thermostat should start to open at
69.5-72.5°C (157-162°F).
D. If the thermostat does not open, it must be
replaced.
3. Inspect all coolant hoses, connections, and
clamps for deterioration, cracks, and wear.
NOTE: All coolant hoses and clamps should be
replaced every four years or 4000 miles.
INSTALLING
1. Place the thermostat and seal into the thermostat
housing; then finger-tighten the thermostat
housing to the mounting bracket with the two
cap screws.
2. Install the remaining two cap screws; then
tighten the four cap screws to specifications.
3. Fill the cooling system with the recommended
amount of antifreeze. Check for leakage.
4. Install the center splash shield; then install the
fenders and front rack.
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KX193A
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