Freeze damage to yer Mopar?

I wouldnt think so, but if you're concerned about engine, run extension cord with trouble light under hood. Enough heat to stop any harm.
When I had chickens that is how I kept their water from freezing. I made a box with a lamp socket and just a regular old 40w bulb and sat their water pan on the box. Just enough heat to keep the water from freezing without overheating it.