[grep]

muscle wire, heat sensitive wire that expands and contracts to perform movement. Strong enough to operate valves, or louvers.
Alternative:
I have seen in effect memory plastic that deforms with heat. A set of plastic driving light covers that were louvered, when cold there closed, when you turn the lights on the heat causes them to deform and opens the louvers.
Alternative:
heat sensitive tracking device that tracks an oponent, then when quake is going really hot and heavy it fires a dart tipped with Cuarre poison and you win.