Moto Grand Prix
Main Motorcycle: '07 Dyna Low Rider
Join Date: Apr 2012
Location: New Hampshire
Other Motorcycle: '99 Legend TT
Extra Motorcycle: Thunderbolt, T150V
Was the fan running when the light was flickering? If not, has the fan ever come on? First thing you need to do is confirm the fan works, otherwise further troubleshooting could be dangerous.
There are several reasons why the light might flicker. First thing you have to do is top off the pressurized part of the system. To do this the tank has to come off. It has to be filled to the point where there is no air in the system. Put the cap on and run the engine (get a long fuel line and put the tank on a table or something.) Open the bleeder on the thermostat housing when the coolant starts to flow through the system, as evidenced by hot hoses to and from the radiator. Once the air is all out, add coolant to the mark on the recovery bottle. Normal expansion and contraction of the coolant will cause the level in the bottle to rise and fall, but when it is cold it should always return to the same level. If it doesn't then you'll need to figure out why.
Once you get the level dealt with, if the light continues to flicker, there are other things to look at, but the level must come first.
Laconia Bike Week 2018
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2007 HD FXDL
1999 Legend TT
1975 T150V, 1968 BSA Thunderbolt, x2004 Thunderbird Sport
Last edited by WSC; 05-07-2019 at 12:12 PM.