First. Turn key to "on" so all the warning lights on the dash light.Check the "Coolant" light comes on and goes off with the rest of them. Wait a couple of minutes. Does "coolant" light come back on even though the engine isn't running? Yes? I expect you've already topped up the reservoir. there indeed is a float directly below the filler cap opening. Stick your finger in there and move the float collar down and up several times. Wait a couple of minutes. Does the light on the dash go out. No? Most likely the reed switch in the pillar of the level switch is fubared. Remove the retaining clip from the coolant reservoir next to the fender. Push the tank towards the motor untill it clears the retaining clips. Look under the tank. disconnect the wiring connector. Short out the two pins of the connector with fine wire, staple or what ever fits the pin holes. IF warning light goes out after a couple of minutes, the level switch is defective. Probably need to order a new tank or get a 'recycled' one. Good luck. Bye the way, my coolant light is on too. :bigroll:
Jerry O