Maybe it doesn't have a cooling system at all and that's why it started malfunctioning in the first place.

[Caesar hasn't the faintest idea on how machines work, but if people are saying a heated machine needs a cooling system, he can connect the dots there at least.]

How did you get through the barrier to touch it at all?

I know Nina was able to shoot through it...

[And that's that. He'd come here to pick a fight, but that didn't even make it past the initial attempt!]