9850043 R01 - 2017-2021 RANGER 500 / 570 Service Manual
© Copyright Polaris Inc.
1.69
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
• 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)
• 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
• Contaminated coolant
GENERAL INFORMATION
1
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