| Trouble | Symptom and possible causes | Remedy |
| Engine overheats | Coolant insufficient. | Top up. |
| Radiator fins obstructed by dirt or debris. | Clean. | |
| Thermostat faulty, jammed in the closed position. | Replace. | |
| Coolant passages obstructed. | Clean. | |
| Air in the cooling circuit. | Bleed the circuit. | |
| Coolant pump faulty. | Replace. | |
| Coolant used does not meet specification. | Change coolant. | |
| Engine will not warm up to regular operating temperature | Thermostat faulty, jammed in the fully open position. | Replace. |
| Very low ambient temperature. | Fit cowl to radiator. |
Radiator troubleshooting information (Aprilia RS125)
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- Information for owner
- Introduction to manual
- Maintenance
- Troubleshooting
- Engine and systems
- Engine repair
- Fuel system
- Cooling and lube system
- Running gear and frame
- Frame and hinged elements
- Front suspension and handlebar
- Rear suspension
- Brake system
- Wheels and tires
- Electric equipment
- Equipment and devices
- Starting and charging system
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