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Fan Control Circuit Operation I Testing
ELECTRICAL
Switch Testing
The fan switch is located on top of the radiator on liquid cooled models, and at the rear of the cylinder head on
air cooled models. Power is supplied to the fan switch via the RedlWhite wire when the ignition key and auxiliary
shut off switch are ON. When the fan switch reaches the specified temperature, it becomes conductive and sends
power to the fan motor. The ground path for the fan motor is through the Brown harness wire.
CAUTION:
Keep hands away from fan blades during this procedure. Serious personal injury could result.
NOTE:
The fan switch 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.
Fan Control
Switch Bypass Test
·Wire Harness Style Switch (Early)
1.
Remove fuel tank if required for access to fan switch wire harness connectors. Disconnect the RedlWhite
wire.
2.
Place a jumper wire between the RedlWhite wire (to the fan) and the RedlWhite terminal on the terminal board.
3.
Turn ignition key (and engine stop switch) "ON". The fan should start running.
4.
If the fan runs with the jumper wire installed (direct battery voltage applied), check the fan control switch and
related wiring. If the fan does not run or runs slowly with direct battery voltage applied, check the fan motor
wiring, ground, and motor condition (refer to Fan Motor Testing this section). Repair or replace as necessary.
·Connector Style Switch (Late)
1.
Disconnect harness from fan switch on radiator.
2.
Place a jumper wire between the wires in the connector.
3.
Turn ignition key (and engine stop switch) "ON". The fan should start running.
4.
If the fan runs with the jumper wire installed, check the fan control switch and connector terminals. If the fan
does not run or runs slowly with the jumper wire installed, check the fan motor wiring, ground, and motor
condition (refer to Fan Motor Testing this section). Repair or replace as necessary.
Fan Control Switch Operation Test
1.
Place switch in a water bath and submerse it to the base of the threads. Do not allow threads to contact
container or inaccurate reading will result.
2.
Heat the coolant slowly and monitor the temperature with a thermometer or Fluke
TM
meter pyrometer. The
switch should be closed (conductive) at the "ON" temperature indicated in the chart, and stay conductive until
the uOFF" temperature is reached.
REFER TO PARTS MANUAL FOR FAN SWITCH APPLICATION
Fan Switch Part Number
Continuity (On)
No Continuity (Off)
4110099
174° F (79° C)
±
5°F
154° F (68° C)
±
5°F
4110114
235° F (113° C)
±
10°F
210° F (99° C)
±
8°F
4110178
190° F (92° C)
±
5°F
175° F (79° C)
±
5°F
4110189
185
0
F (85° C)
±
7°F
165° F (74° C)
±
8°F
4110201
4110225
185° F (85° C)
±
7°F
157
0
F (69° C)
±
7°F
4110226
174° F (79° C)
±
7°F
146° F (63° C)
±
7°F
4110256
185° F (85° C)
±
7°F
165
0
F (74° C)
±
8°F
Polaris Industries Inc.
10.41
12/97
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Troubleshooting
