Bathroom sink stayed liquid overnight with just dripping, but the kitchen sink is on an exterior wall and froze solid last night. I got under there with a heat gun and got the water flowing again, fortunately the whole system didn’t freeze so nothing burst. I also installed a heating cable with a thermostat on the pipe, got it wrapped up snug under some foam insulation, hopefully that’ll keep it liquid as long as I keep some water running through it. gonna monitor tonight and see how it goes.

Sorry for no pics, it is very cold and I went as fast as possible.