What is a third TICK?
Your gauge picture tells me you are at 105C
[ approx]

Low fan has nothing to do with temp
It is activated by the sw at the drier that I want you to jumper.
It is a PRESSURE sw and is activated when the a/c high side pressure gets up to a high thermal load pressure spec.
Don't confuse the 2 .. they are INDEPENDENT of each other..

Rewmember
HIGH fan is to cool the engine off when it gets above 107C
The LOW fan is tripped when the a/c pressure gets high from , like - "A HOT day when you put on the a/c...
If you don;t put on the a/c , don't look for a LOW fan.. it won't happen.....