Honda FourTrax Foreman TRX500FE2 2018 Owner's Manual page 240

If the High Coolant Temperature
Indicator Lights
• If the reserve tank is low or empty, don't ride without adding
coolant (page 149). After adding coolant, turn the engine on and
check the coolant temperature gauge and high coolant
temperature indicator.
If the indicator doesn't turn off, do not ride. The engine needs
repair.
Transport your ATV to your dealer (page 210).
If the temperature drops to normal, check the coolant level. If it
has gone down, add more coolant.
• Check for an oil leak.
• Check the oil level. If necessary, add the recommended oil
(page 136) to the upper level mark. If you must leave your ATV to
get oil, secure it as much as possible.
• Start the engine, and check that the coolant temperature gauge
and high coolant temperature indicator goes off.
If you are able to resume riding, continue to monitor the coolant
temperature gauge and high coolant temperature indicator
frequently.
If there is an oil leak — do not ride the ATV until the leak is repaired
by your dealer (page 210).
If there's a mild coolant leak, you can ride for awhile, carefully
watching the coolant temperature gauge and indicator. Be prepared
to stop and add more coolant or water. If the leak is bad, transport
your ATV to your dealer (page 210).
230 Taking Care of the Unexpected