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Fan Control Circuit Operation / Testing
Power is supplied to th e fan via the Ora nge/Black wire
when the relay is ON. The ground path for the fan motor
is thr ough the Bro wn ha rness wi re. 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.
NOTE: The fan may not function or operation may
be delayed if coolant level is low or if air is trapped in
the coo ling system. Be su re coo ling 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 coolant temperature sensor
on th e en gine cylin der h ead (see Ch apter 4 fo r
location).
2. With the transmission in Park, start the engine. After
a few seconds, the fan should start running and the
"Check Engin e" ind icator should d isplay on the
instrument
cluster. This indic
components are working properly.
3. If the fan does not run or runs slowly, check the fan
motor wiring, ground, motor condition and mechanical
relay fo r pr oper op eration. Re pair or replace as
necessary. If the fan runs with the se nsor ha rness
disconnected, but will not turn on when the engine is
hot, ch eck th e coolant te mperature sensor and
connector terminals.
Coolant Temperature Sensor
The coolant temperature sensor can be tested u sing an
ohmmeter or voltmeter.
1. With the engine an d temp erature se nsor at room
2. With the m eter in th e o hms m ode, p lace th e meter
3. Use the ta ble T emperature / Resistance t able t o
NOTE: If the coo lant t emperature sen sor o r circu it
malfunctions the radiator fan will default to 'ON'.
ates al l
other
9923523 - 2012 RANGER RZR 570 Service Manual
© Copyright 2011 Polaris Sales Inc.
°
°
temperature (68
F = 20
C), disconnect the harness.
leads onto the sensor contacts.
determine if the sensor needs to be replaced.
T
F (C)
EMPERATURE
68
F (20
C)
212
F (100
C)
ELECTRICAL
R
ESISTANCE
2.5 k
6%
186
2%
10
10.21
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Troubleshooting
