engine brain should have noticed right away if alternator stopped turning or charging. triggering lights and warnings.
water pump stopped pretty fast as well and this should also trigger the wrench light.
in my bus, i blew a clamp on the coolant hose, it sprayed coolant everywhere from under the hose clamp, and set off a LOW coolant light( my first indication), which tripped off cruise, and engine brake then the dreaded DANGER will Robinson shut off the engine light , followed by RED stop now lights, never did engine temp go above 212F.
replaced clamp and refilled the 2 quarts of fluid loss and off we went
do you remember if the temp spiked or was it all just warning lights
yes let warranty take over. I know they can plug in and see if any temps were exceeded. sucks to have road problems.