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9928491 R04 - 2017-2018 RZR XP Turbo / XP4 Turbo Service Manual
© Copyright Polaris Industries Inc.
3.95
COOLING TROUBLESHOOTING
Overheating
• Low coolant level
• Air in cooling system
• Wrong type/mix of coolant
• Faulty pressure cap or system leaks
• 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
• Electrical malfunction
• Water pump failure/ Loose impeller
• Thermistor failure
• Cooling fan inoperative or turning too slowly (perform
current draw test)
• Low oil level
• Spark plug incorrect heat range
• Faulty hot light circuit
• Thermostat stuck closed or not opening completely
• Radiator is missing its internal diverter plate not
allowing coolant to flow through entire radiator
Temperature Too Low
• Thermostat stuck open
Leak at Water Pump Weep Hole
• Faulty water pump mechanical seal (coolant leak)
• Faulty pump shaft oil seal (oil leak)
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 3.21 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
• Check exhaust manifold for leaks and check torque on
mounting bolts.
• Check for proper motion of waste gate (see Actuator /
Wastegate Inspection, page 3.24).
– Replace pod if actuator / wastegate is sticky or
loose.
• Inspect dump valve for damage or debris.
– Inspect hoses running to / from dump valve
• Check dump valve is actuating / sealing properly
– Apply 5 PSI with a hand pump to the top of the
dump valve. Pressure should hold if the valve is
good..
– Apply slight vacuum using a MityVac. If vacuum
holds, the valve is not leaking. Replace dump valve
if it fails either test.
• Check oil feed / return line to turbo for leaks, damage
or blockage.
• Check for modified boost pressure sensor wiring.
ENGINE / COOLING SYSTEM
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