Honda FourTrax Foreman TRX500FM2 2018 Owner's Manual page 162

Coolant
To clean the radiator core and radiator grill plate:
1. Remove the radiator cap lid (page 149).
2. Remove the reserve tank (1) by removing the bolt (2) and clips (3)
(page 129).
3. Release the hoses (4) from the guides.
4. Hold the reserve tank being careful not to spill the coolant.
LEFT FRONT
(2)
(3)
(1) reserve tank
(2) bolt
152 Servicing Your Honda
(1)
(4)
(3) clips
(4) hoses
(3)