115
THERMOSTAT
Removing
1. Drain approximately one quart of coolant from the
cooling system.
2. Remove the two cap screws securing the thermostat
housing to the cylinder head. Account for an O-ring
and a thermostat.
Inspecting
1. Inspect the thermostat for corrosion or spring dam-
age.
2. Using the following procedure, inspect the thermo-
stat 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 71-86° C
(160-187° 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 O-ring into the thermostat
housing; then secure the thermostat housing to the
cylinder head with the two cap screws.
2. Fill the cooling system with the recommended
amount of antifreeze (see Periodic Mainte-
nance/Tune-up). Check for leakage.
COOLING FAN
Removing
1. Remove the radiator (see RADIATOR in this
sub-section).
2. Remove the fan assembly from the radiator.
Installing
1. Position the fan assembly on the radiator; then secure
with existing hardware.
NOTE: The fan wiring must be in the upper-right
position.
2. Install the radiator.
WATER PUMP
NOTE: On the 550/700, the water pump is a
non-serviceable component. It must be replaced as an
assembly. On the 500 to service the water pump, see
Servicing Left-Side Components.
Removing
1. Remove the radiator cap; then remove the water
pump drain and drain the coolant.
XR151A
2. Drain the oil from the engine/transmission.
3. Remove the left side engine cover.
4. Loosen the hose clamps and slide the clamps away
from the hose ends approximately 2 in.; then remove
both hoses from the water pump.
5. Remove the two cap screws securing the water pump
to the engine; then remove the water pump.
XR151C
Installing
1. Secure the water pump to the engine with the two
cap screws tightened securely.
2. Connect the two coolant hoses to the water pump and
secure with the clamps. Tighten securely.
3. Install the left side engine cover.
4. Fill the engine/transmission with the proper amount
of recommended oil.
5. Fill the cooling system with the proper amount of
recommended coolant (see Periodic Mainte-
nance/Tune-up). Check for leaks.
Troubleshooting
Summary of Contents for 2016 Alterra 500
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