I believe the TC5 only uses ATC on the normal-eco cycle, but someone more experienced than me, combo52/John for example, can feel free to correct or expand on that.
Does SQ have a direct ATC sensor on any of their toploaders? There doesn't appear to be anything on the parts diagrams or integral to the inlet valves per photos.
Operational descriptions I've read seem to indicate that the Normal Eco cycle runs hot or warm wash fill for a fixed time at the beginning then switches to cold.