Radiator fan
WintrSol:
A PO of my bike added a water temp gauge and oil pressure gauge, both very handy, so I know exactly what temperature my fan comes on. Never seen the temp line on while engine was running. Also, my fan doesn't run very often, unless I'm getting off a high-speed run onto a slow side road.
Make sure your cooling system has no air in it; the coolant return bottle should rise and fall, and, when removing the radiator cap (cold), the radiator should be full to the top. An air bubble at the thermostat can cause the light to come on because coolant doesn't surround the switch. If necessary, when refilling the coolant, I have the front tire up on a board to lift the front before the first warmup, then check for air after it cools.
Oceandiver11764:
Quote from: WintrSol on July 20, 2025, 02:02:32 PM
A PO of my bike added a water temp gauge and oil pressure gauge, both very handy, so I know exactly what temperature my fan comes on. Never seen the temp line on while engine was running. Also, my fan doesn't run very often, unless I'm getting off a high-speed run onto a slow side road.
Make sure your cooling system has no air in it; the coolant return bottle should rise and fall, and, when removing the radiator cap (cold), the radiator should be full to the top. An air bubble at the thermostat can cause the light to come on because coolant doesn't surround the switch. If necessary, when refilling the coolant, I have the front tire up on a board to lift the front before the first warmup, then check for air after it cools.
Thanks for the tips. I will engage them in the next day or so, to make sure of things. I just went for another test ride, came back, and the fan kicked on in my garage, no red light. Only things I changed were the switch itself, and after seeing the ohm meter, removing all traces of teflon (and of course screwing the switch in/out several times during the process contributed to cleaning up the threads).
Last question and I'll leave you alone. I read in several posts (some were for cars) that the radiator ground wire can mess up, causing the same problem. I was thinking of running a new ground wire from the radiator to the frame...just to make sure I have a good ground on the radiator. What do you think of this idea?
WintrSol:
Extra grounds never hurt, IMO, as long as you have good, clean attachments.
98valk:
Quote from: WintrSol on July 20, 2025, 08:11:41 PM
Extra grounds never hurt, IMO, as long as you have good, clean attachments.
sometimes double grounds make things not to work. like auxiliary lights and horns.
WintrSol:
Quote from: 98valk on July 21, 2025, 12:16:08 PM
Quote from: WintrSol on July 20, 2025, 08:11:41 PM
Extra grounds never hurt, IMO, as long as you have good, clean attachments.
sometimes double grounds make things not to work. like auxiliary lights and horns.
Depends on where, ans what the ground supports. The only thing grounded to the radiator is the fan bypass filter, on the Interstate, and a better ground would only help. But, yes, electronics can suffer from a ground loop with multi-point grounds. Lights and horns, usually not.
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