[Shotimes] I'm not sure

[John Driscoll]

I've had three SHOs, one 95 and two 91 models. This question is for my 91.

My problem:the "Low Coolant" light keeps coming on&off even though the rad is
ok. The  fluid level is good, no leaks, full pressure, normal operating temp,
all coolant/temp related sensors are fine, fan works,also there's no fuse to
control this idiot light, so what 'am I to do?  According to my manual, I need
to service the car as soon as possible.  I also don't think the radiator has
ever been cleaned as I noticed some green seaweed like build up under the
radiator cap.  The plastic fill tank has been cleaned and checked out ok.
Help!!!!!