Page 196 - 2019 SHOP MANUAL CRF1000/A/D

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COOLING SYSTEM
SERVICE INFORMATION
COOLING SYSTEM
GENERAL

Removing the radiator cap while the engine is hot can allow the coolant to spray out, seriously scalding you.
Always let the engine and radiator cool down before removing the radiator cap.

Using coolant with silicate corrosion inhibitors may cause premature wear of water pump seals or blockage of radiator passages.
Using tap water may cause engine damage.
• Add coolant at the reserve tank. Do not remove the radiator cap except to refill or drain the system.
• All cooling system services can be done with the engine installed in the frame.
• Avoid spilling coolant on painted surfaces.
• After servicing the system, check for leaks with a cooling system tester.
• Refer to the ECT sensor inspection (page 22-18).

TROUBLESHOOTING

Engine temperature too high
• Faulty temperature gauge or ECT sensor
• Thermostat stuck closed
• Faulty radiator cap
• Insufficient coolant
• Passage blocked in radiator, hoses or water jacket
• Air in system
• Faulty cooling fan motor
• Faulty fan control relay
• Faulty water pump
Engine temperature too low
• Faulty temperature gauge or ECT sensor
• Thermostat stuck open
• Faulty fan control relay
Coolant leak
• Faulty water pump mechanical seal
• Deteriorated O-rings
• Faulty radiator cap
• Damaged or deteriorated cylinder head gasket
• Loose hose connection or clamp
• Damaged or deteriorated hose
• Damaged radiator

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