Also have the same exact symptoms ie: coolant light on - fluid reservor is full
ac is intermittant cold / warm
seems light comes on when ac is engaged
One post did say light will come on when fan is supposed to kick in but does not.

I did have the fan recall done a while ago
I believe fan and module were replaced under recall.
fan module part number & cost ?
will jump out the fan - after reading archives, it seems it is evenly split between fan and module