Coolant warning light on TC2000/RE
This is a 1998 BB TCRE. 8.3L 6CTA with a P7100 pump (all mechanical)
So I've got this coolant warning light that flickers sometimes, stays off for long periods, then stays on for a while too.
The coolant level in the expansion tank is full, I get lots of heat out front. There's a little what I imagine is some sort of bleeder valve resting on the radiator, one end connects to the top of the radiator and the other back to the tank. I've ran it with heat open and closed, bleeder open/closed. It doesn't seem to make a difference.
Additionally, there's a sensor that goes into the expansion tank, and unplugging or plugging it doesn't seem to affect the light at all. (if it's on, it'll be on, if it's off, it'll stay off)
Can someone confirm that the dash indicator (looks like a flag with two "wavy" lines over each other) is truly a coolant level light? I wonder if I've got a short in the dash, or perhaps there's another sender somewhere on the engine I'm missing.