Service Information; Troubleshooting; Cooling System Testing - KYMCO Downtown 300i ABS Service Manual

12. COOLING SYSTEM

SERVICE INFORMATION

GENERAL INSTRUCTIONS
• The water pump must be serviced after removing the engine. Other cooling system service can
be done with the engine installed in the frame.
• The engine must be cool before servicing the cooling system.
When the coolant temperature is over 100℃, never remove the radiator cap to release the
pressure because the boiling coolant may cause danger.
• Avoid spilling coolant on painted surfaces because the coolant will corrode the painted surfaces.
Wash off any spilled coolant with fresh water as soon as possible.
• After servicing the system, check for leaks with a cooling system tester.
TORQUE VALUES
Water pump impeller
Water pump cover bolt

TROUBLESHOOTING

Engine temperature too high
• Faulty temperature gauge or thermosensor
• Faulty radiator cap
• Faulty thermostat
• Insufficient coolant
• Passages blocked in hoses or water jacket
• Clogged radiator fins
• Passages blocked in radiator
• Faulty water pump
Temperature gauge shows the wrong temperature
• Faulty temperature gauge or thermosensor
• Faulty thermostat
SPECIFICATIONS
Radiator cap relief pressure
Thermostat temperature
Coolant capacity
1.0~1.4 kgf-m (11.8 N-m)
1.0~1.4 kgf-m (11.8 N-m)
0.9±0.15 kg/cm²
Begins to open 71 ℃
80 ℃
Full-open
Valve lift 3.5～4.5 mm
Total 1719 cc
Coolant leaks
• Faulty pump mechanical (water) seal
• Deteriorated O-rings
• Damaged or deteriorated water hoses
Radiator: 766 cc
Reserve tank: 590 cc
Hose: 363 cc
Downtown 300i ABS
12-2