10.19
ELECTRICAL
10
9923412 - 2012 Sportsman 400/500 and EFI Tractor Service Manual
© Copyright 2011 Polaris Sales Inc.
Coolant Temperature Fan Switch - H.O.
The coolant temperature fan switch can be tested using an
ohmmeter.
If the fan switch circuit is open or failed, the engine “HOT”
light
displays but the fan will not operate. It is
recommended that the fan switch be removed for testing,
as testing on the engine can be difficult to obtain a true test
reading.
1. With the engine and temperature sensor at room
temp
erature (68
°F = 20°C), disconnect the harness
connector.
2. Drain the coolant sufficient enough to allow fan switch
remov
al. Remove the fan switch from the cylinder
head (recommended).
3. Place the fan switch in a water bath. Do not allow the
sen
sor to touch the bottom of the water container.
Slowly heat the water to 190°F (88°C) minimum. Use
the Temperature / Resistance table to determine if the
sensor needs to be replaced.
NOTE: If the coolant temperature sensor or circuit
c
omponents malfunction, ‘HOT’ will display on the
instrument cluster, but the fan will not operate.
NOTE: The fan may not function or operation may
be delayed if cool
ant level is low or if air is trapped in
the cooling system. Verify the cooling system is full
and purged of air. Refer to Maintenance Chapter 2
for cooling system information.
GEAR POSITION INDICATOR SWITCH
Test Diagram
Refer to “TEST 8 - Transmission Shift Indicator Not
Working” on page 10.15.
Table 10-2: H.O. Fan Switch
TEMPERATURE F (C) RESISTANCE
149F (65C) 4 Open - (infinity)
180
F (82C) 8
Closed - 0.0
High
Range
Low
Range
Neutral
Orange/Red
Violet (purple)
Green/White
Brown/Red (Carb - Bn)
White/Blue
Blue/Red
TRANSMISSION SWITCH
High/Low/Neutral/Reverse/Park
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