160 is the thermostat setting for the engine. The smoke in your video is completely normal. I would not worry about the engine.

The heater pump not having movement or vibration means it is not working. I would look for a fuse or breaker under the helm. However, if you don't lose anymore coolant while it is not working then that answers the question about where it was going.

The pump should have vibration to it or even some slight noise (might be hard to hear over the heater fan). Something to check while waiting for your UV light.