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6. COOLING SYSTEM MXU 550EXi/MXU500i
TORQUE VALUES
Water pump cover bolt 1.3 kgf-m (13 N-m, 9 lbf-ft)
Fan motor bolt 0.53 kgf-m (5 N-m, 3.8 lbf-ft)
Fan motor switch 1.8 kgf-m (17 N-m, 13 lbf-ft)
TROUBLESHOOTING
Engine temperature too high
· Faulty radiator cap
· Faulty temperature gauge or thermosensor
· Air in system
· Thermostat stuck closed
· Insufficient coolant
· Passages blocked in radiator, hoses or water jacket
· Faulty cooling fan motor
· Faulty fan motor switch
· Faulty water pump
Engine temperature too low
· Faulty temperature gauge or thermosensor
· Thermostat stuck open
· Faulty fan motor switch
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 hoses
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