High Engine Temp
Generac
Overheating in air-cooled engine
Air-cooled Generac standby generator shuts down with 'High Engine Temp' alarm, often during hot weather or heavy load.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Blocked cooling air intake or exhaust, Dirty cylinder head cooling fins, Failed engine cooling fan, Enclosure ventilation issues
How to Fix / Troubleshooting
Safety: Turn the generator OFF and allow it to cool. Do not remove guards or panels with the engine running.
- Clear air passages: Remove the side panels per the manual. Clean grass, dust, and debris from the intake and exhaust vents and from around the flywheel fan.
- Clean cooling fins: Use compressed air to blow debris from the cylinder head and block cooling fins. Avoid bending fins.
- Check fan and shrouds: Inspect the flywheel fan and plastic shrouds for damage or misalignment. Replace broken shrouds or fan blades to restore proper airflow.
- Verify enclosure ventilation: Ensure the generator is installed with the clearances specified by Generac and that no structures or vegetation block airflow.
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Repair Difficulty
Medium
3/5
Required Part
Flywheel Cooling Fan
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