Thermostat Testing - Arctic Cat Cougar Service Manual

COOLING SYSTEMS
WARNING
Make sure the engine is cool before pro-
ceeding with Step 2. Severe scalding
could result
if
hot coolant comes in con-
tact with your skin.
305
2. Drain the cooling system as described in
Chapter Three.
3. Locate the outlet housing (Figure 11) at-
tached to the cylinder heads.
4. Loosen the clamp on the outlet hose and
detach the hose from the outlet fitting.
5. Unbolt the thermostat housing (Figure 11
and 12) from the outlet housing and carefully
separate the housings.
6. Remove the thermostat (Figure 10).
Testing
Test the thermostat to ensure proper operation.
The thermostat should be replaced if it remains
open at normal room temperature or stays closed
after the specified temperature has been reached
during the test procedure.
1. Pour some water into a container that can be
heated. Submerge the thermostat in the water and
suspend a thermometer as shown in Figure 13.
Use a thermometer rated higher than the test
temperature.
NOTE
Suspend the thermostat with wire so it
does not touch the sides or bottom of the
pan.
2. Heat the water until the thermostat starts to
open. Check the water temperature with ather-
mometer. It should be approximately 107° F ( 42°
C). If the thermostat valve did not start to open
at the correct temperature, replace it.
3. Let the water cool to 10° under the thermo-
stat's rated opening temperature. If the thermo-
stat valve is not fully closed at this temperature,
replace it.
4. Remove the thermostat from the water and let
it cool to room temperature. Hold it close to a