12.18
9850043 R01 - 2017-2021 RANGER 500 / 570 Service Manual
© Copyright Polaris Inc.
COOLING SYSTEM
FAN CONTROL CIRCUIT OPERATION
Power is supplied to the fan via the Orange/Black wire
when the relay is energized. The brown wire provides a
ground path for the fan motor. Refer to “RELAYS” later in
this chapter for more information on fan functions.
CAUTION
Keep hands away from fan blades during operation.
Serious personal injury could result.
NOTICE
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 Chapter 2 “Maintenance” for cooling system
information.
FAN CONTROL CIRCUIT BYPASS TEST
1. Disconnect harness from the engine coolant
temperature sensor located in the cylinder head of
the engine.
2. With the vehicle in park, turn the key on. After a few
seconds, you should hear the cooling fan turn on and
remain running.
3. If the fan does not run or runs slowly, check the fan
motor wiring, wire connections, ground path, 12V
power input, and fan motor condition. Repair or
replace as necessary. If the fan runs while the engine
is running with the sensor harness disconnected, but
will not turn on when the engine is hot, verify the
coolant level is correct and check the coolant
temperature sensor and connector terminals.
ELECTRICAL
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