10
9929419 R02 - 2018-2019 RZR XP / XP 4 Turbo S Service Manual
© Copyright Polaris Industries Inc.
10.15
COOLING TROUBLESHOOTING
Overheating
• Low coolant level
• Air in cooling system
• Wrong type/mix of coolant
• Faulty pressure cap or system
leaks
• High oil level
• Spark plug incorrect heat range
• Radiator is missing its internal
diverter plate not allowing coolant
to flow through entire radiator
• Restricted system (mud or debris
in radiator fins causing restriction
to air flow, passages blocked in
radiator, lines, pump, or water
jacket, accident damage)
• Lean mixture (vents, fuel pump or
fuel valve)
• Fuel pump output weak
• Cooling fan inoperative or turning
too slowly (perform current draw
test)
• Faulty hot light circuit
• Electrical malfunction
• Water pump failure/ Loose
impeller
• Thermistor failure
• Low oil level
• Thermostat stuck closed or not
opening completely
Leak at Water Pump Weep Hole
• Faulty water pump mechanical seal (coolant leak) • Faulty pump shaft oil seal (oil leak)
Temperature Too Low
• Thermostat stuck open
• Thermostat opening too soon
• Incorrect coolant mixture
• Contaminated coolant
TURBOCHARGER TROUBLESHOOTING
Common symptoms of turbocharger issues would be reduced power, vehicle in limp-home mode, and trouble codes
being set relating to the turbo / boost pressure.
Refer to Turbocharger Inspection page for further information.
• Check charge air duct and LCAC for damage.
• Check all duct clamps for proper retention.
• Check boost pressure sensor and TMAP for proper
sealing.
– Check wires running to both Sensors for damage
or wear
– Check wire continuity end to end
• Inspect waste gate for damage or debris.
– Inspect hoses running to / from waste gate
• Check for modified boost pressure sensor wiring.
• Check exhaust manifold for leaks and check torque on
mounting bolts.
• Check for proper motion of waste gate (see Actuator /
Wastegate Inspection page 3.28).
– Replace pod if actuator / waste gate is sticky or
loose.
• Check waste gate is actuating / sealing properly
– Apply 5 PSI with a hand pump to the top of the
waste gate. Pressure should hold if the waste gate
is good..
– Apply slight vacuum using a MityVac. If vacuum
holds, the valve is not leaking. Replace waste gate
if it fails either test.
• Check oil feed / return line to turbo for leaks, damage
or blockage.
DIAGNOSTIC
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