3
9929422 R02 - 2017-2019 ACE 900 Service Manual
© Copyright Polaris Industries Inc.
3.21
THERMOSTAT REPLACEMENT
WARNING
Never drain the coolant when the engine and radiator
are warm or hot. Hot coolant can cause severe burns.
Allow engine and radiator to cool.
1. Open the front box cover and remove the front
storage bin from the vehicle.
2. Slowly remove the pressure cap to relieve any
cooling system pressure.
3. Remove the lower radiator hose
w
and drain coolant
to a level below the thermostat housing.
4. Loosen the hose clamp
e
and remove the coolant
hose from the thermostat cover.
5. Remove the two bolts
r
that retain the thermostat
cover to the engine.
6. Remove the thermostat cover, seal
t
and thermostat
y
from the engine.
NOTE
Thermostat has a pop-off relief to allow the bypass
system to operate until the thermostat opens.
7. Clean the thermostat mating surfaces on the engine
and thermostat cover.
8. Install a new thermostat and seal into the cover and
install the cover onto the engine.
9. Install the thermostat cover bolts. Torque bolts to
specification.
TORQUE
Thermostat Cover Bolts:
7 ft-lbs (10 Nm)
10.Reinstall coolant hose and refill cooling system.
Bleed the cooling system.
ENGINE / COOLING SYSTEM
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