Re: Malfunction or not?
Or it might be - if the leak was a material defect. Either way, the light working is nice, but is not the real issue of defect nor does it absolve one from the defect.
...unless you are 'old' GM.
Whether there's a malfunction or not would depend on what caused the overheating, no? Failure to attend to a coolant leak might not be the manufacturer's problem.
...unless you are 'old' GM.