First I read that as "really hot" because I was thinking Celsius. Then I thought, "well, if it were 32 degrees, it'd be awfully hard to drink. Not to mention that problem of exploding..."

Keeping it on the right side of 32 degrees would be difficult, but 42 degrees isn't even close.

If you add ice to a drink, the drink quickly hits 32 degrees, or very close of the volume is large enough such that there is a delay while convection currents opperate. As long as the surroundings are warmer that the liquid, the ice will continue to melt into 32 degree water as the outside enviroment supplies the transition energy between ice at 32 degrees and water at 32 degrees.

Theoretically if the pop machine kept the insides at exactly 32 degrees, any ice that was put inside would stay ice, and any liquid would stay liquid. Keeping the temperature exactly right would be admitedly difficult.

I'd certainly be willing to grant them 33 degrees as ice cold. Maybe 35. 42 is right out :)