Honda 2009 GOLDWING GL1800 Owner's Manual page 236

If Your Engine Overheats
If the reserve tank is low or empty, don't ride without adding coolant
(page 171 ). After adding coolant, turn the engine on and check the
temperature gauge.
If the needle doesn't drop, do not ride. The engine needs repair. Transport
your motorcycle to a Honda dealer (page
If the temperature drops to normal, check the coolant level. If it has gone
down, add more coolant.
If you are able to resume riding, continue to monitor the gauge frequently.
If there's a mild leak, you can ride for awhile, carefully watching the gauge. Be
prepared to stop and add more coolant or water. If the leak is bad, transport your
motorcycle to a Honda dealer (page
230
Taking Care of the Unexpected
210 ).
210 ).