Question on Coolant Change / Burping / Fan
Not an urgent item, but I have done a few searches and couldn't find an answer, so here goes another coolant question:
I did a coolant drain and refill on my 1300 a few months back. After the refill, I ran the engine a few minutes with the radiator cap off and blipped the throttle, but really didn't see any air bubbles. Overflow level is ok at the low line. I didn't think much of it, and closed it up and haven't thought about it much. Have been on many rides with no issues whatsoever. Then I recently put on some fork deflectors for buffeting, and am just now noticing how hot the engine gets near my legs, so then I got to thinking back to the coolant change and the "no air bubbles", and wondering if I could have air pockets in the system somewhere.
Just to note, my radiator fan is working fine, it turns on now and then.
My question is, since my fan is working and I have not had any overheating type issues, am I just getting paranoid about the extra heat (likely due to the new fork deflectors?). Is there a definitive way to know if there is air in the system? Does the radiator fan turn on ONLY in response to coolant in the radiator? --- or can it turn on even if there is no coolant flowing in the radiator?
I'll probably wind up doing a radiator/coolant top off and try to get some air bubbles, but just wanted to throw it out there to see what you fellas think.