Sym MAXSYM 400i Service Manual page 166

Troubleshooting
The engine temperature is too high
The water thermometer and the temperature sensor do not work properly.
The thermostat is stuck to close.
Insufficient coolant.
The water hose and jacket are clogged.
Fan motor malfunction.
The malfunction of the radiator filler cap.
The engine temperature is too low
The malfunction of the water thermometer and the temperature sensor.
The thermostat is stuck to open.
Coolant is leaking
The water pump mechanical seal does not function properly.
The O ring is deteriorated.
The water hose is broken or aged.
To this chapter contents
12. Cooling System
12-3