Polaris 2007 Sportsman 450 EFI, Service Manual

Page: 343 / 406

10.25
ELECTRICAL
10
COOLING SYSTEM COMPONENTS
Fan Control Circuit Operation
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 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 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.
Fan Motor Current Draw Test
A current draw test will provide a good indication of fan motor
condition. A worn or damaged fan motor will draw more
current, which causes a reduction in blade speed and reduced
cooling.
1. Disconnect the harness from the coolant sensor.
2. Connect a DC ammeter in between the fan switch harness
wires as shown.
3. Be sure fan blade is free to rotate.
4. Turn ignition key and engine stop switch to ON" position.
Read the current draw on ammeter with fan running.
5. If the fan motor draws more than 10 Amps, replace the
motor.
NOTE: This fan motor current draw specification
only applies to Sportsman EFI models.
CAUTION
Keep hands away from fan blades during operation.
Serious personal injury could result.
Fan Motor Current Draw:
Should Be Less Than 10 Amps
Connect Ammeter
Between OG/Black
OG/
Fan
Brn
OG/
Fan