Thanks, I located it, but man is it inaccessible. I removed the fender shroud and still could not get my hands or tools close enough to remove it.
I drove it a lot afterwards and it finally quit blinking. I had added coolant a couple weeks ago because the overflow container was empty.
The only thing I can think of is there was an air lock in the radiator and if finally burped and let the coolant fill up the void. I will keep checking it.
I am apparently not strong enough to press the radiator cap in enough to remove the cap (of course when it is cold), I'll get my son to remove and replace it.
Thanks for your "free" advise.