10.16
ELECTRICAL
COOLING SYSTEM COMPONENTS
Fan Control Circuit Operation / Testing
Power is supplied to the fan via the Orange/Black wire when the
relay is ON. The ground path for the fan motor is through the
Brown harness wire. Refer to “RELAYS” later in this chapter
for more information on fan functions.
NOTE: The fan may not function or operation may
be delayed if coolant level is low or if air is trapped in
the cooling system. Be sure cooling system is full
and purged of air. Refer to Maintenance Chapter 2
for cooling system information.
Fan Control Circuit Bypass Test
1. Disconnect harness from coolant temperature sensor on
engine.
2. With the ATV in “Park” and with the parking brake on, turn
the ignition key (and engine stop switch) “ON”. The fan
should start running.
3. If the fan does not run or runs slowly, check the fan motor
wiring, ground, motor condition and mechanical relay for
proper operation (refer to “FAN MOTOR CURRENT
DRAW” in this section). Repair or replace as necessary.
If the fan runs with the sensor harness disconnected, but
will not turn on when the engine is hot, check the coolant
temperature sensor and connector terminals.
Coolant Temperature Sensor
The coolant temperature sensor can be tested using an ohmmeter
or voltmeter.
1. With the engine and temperature sensor at room
temperature (68
F = 20C), disconnect the harness
connector.
2. With the meter in the ohms mode, place the meter leads
onto the sensor contacts.
3. Use the table Temperature / Resistance table to determine
if the sensor needs to be replaced.
NOTE: If the coolant temperature sensor or circuit
malfunctions the radiator fan will default to 'ON'.
NOTE: The fan may not function or operation may
be delayed if coolant level is low or if air is trapped in
the cooling system. Be sure cooling system is full
and purged of air. Refer to Maintenance Chapter 2
for cooling system information.
CAUTION
Keep hands away from fan blades during operation.
Serious personal injury could result.
TEMPERATURE F (C) RESISTANCE
68F (20 C) 2.5 k
212F (100 C) 0.186
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