Page 39 - Manual_Polaris_RZR_ProXP-20-21

GENERAL INFORMATION

OVER HEATING • Make sure the cooling fan is engaging. Command
cooling fans on and off using Digital Wrench to
1. Verify coolant is filled to correct level. 1
check operation.
• If coolant is low, fill to correct level.
• Monitor engine temperature using Digital Wrench®
2. Test and check for correct coolant mixture. viewing the Engine Temperature PID. Once engine
has reached running temperature cooling fan
• If coolant mix is incorrect, correct mixture as should engage.
necessary.
8. Water Pump / Thermostat / Radiator may be suspect
• If incorrect coolant was used in vehicle, flush cooling of concern.
system and bleed, fill to correct level, and recheck.
• Thermostat could be opening too slowly or stuck
closed. Check temperature using Digital Wrench®
3. Check cooling system using combustion leak tester viewing the Engine Temperature to check for
for any combustion gasses entering the cooling correct operation.
system. This may suggest a head gasket, cylinder
head failure, or other engine damage. Adding coolant • Water pump may be faulty or not circulating
before test may dilute the system and cause enough coolant to keep temperature within
inaccurate test results. specification.

4. Check Radiator and cooling fans for restrictions or • Radiator core may not be functioning correctly or
damage failed causing concern.
• Check for debris, dirt, or mud between fan and
radiator restricting air flow. If present, clean and 9. Faulty Temp Sensor / Circuit / ECU.
recheck. • Confirm engine is overheating. It could be possible
that the coolant sensor is sending an incorrect
• Check for damage to radiator or cooling fans. If signal causing the ECU to think the vehicle is
damage is found to components repair or replace overheating when it is running at the proper
as necessary.
temperature.
• Inspect for any aftermarket modifications that may • Check connections at temp sensor and wiring. If
be restricting air flow. (Radiator Modifications, Grille damage is found repair, as needed.
Modifications, Aftermarket Bumpers, Lightbars,
etc.) Pay close attention to the Radiator Shroud • Resistance test sensor, refer to ECT Sensor test. If
presence and placement. test fails, replace sensor.
• If concern is still present after sensor replacement
5. Check for coolant leaks / air pockets.
suspect the ECU is not receiving correct signal
• Visually check all hoses and radiator for leaks. If input. Inspect circuit wiring.
leaks are found repair as necessary.
10.Engine Damage
• Check cooling system using coolant pressure
tester. If leaks can not be seen on visual inspection, • The overheating concern may be caused by an
refer to Engine / Cooling system for more engine concern.
information.
• Refer to the necessary section in the Service
• Check for air in cooling system. Bleed the cooling Manual for further engine testing.
system if needed.
11. Inspect ECU calibration level.
6. Check Oil level. • If any ECU calibrations are available, update at this
• Low oil level or oil in need of changing may cause time.
increase in engine temperature.
• Too high of oil level may cause engine
temperatures may cause increase in engine
temperature.
• Check level and correct as necessary. Check
maintenance history to determine if oil need to be
changed.

7. Check Cooling Fan operation.

9930583 R01 - 2020-2021 RZR PRO XP / XP 4 Service Manual 1.33
© Copyright Polaris Industries Inc.