Honda FourTrax Foreman TRX500FE2 2019 Owner's Manual page 160

Coolant
To clean the radiator core and radiator grill plate:
1. Remove the radiator cap lid (page 147).
2. Remove the reserve tank (1) by removing the bolt (2) and clips (3)
(page 127).
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
150 Servicing Your Honda
(1)
(4)
(3) clips
(4) hoses
(3)