Can AIO coolers freeze?

A friend of mine got a prebuilt as a gift and it had a cheap China brand AIO pump inside, I've had a Corsair 240 AIO pump laying around and collecting dust for the last year or two. As of now the cooler sits out in the garage in the original packaging and it's winter where I live (below 0) and I'm wondering if you guys think the cooler is still worth throwing in. I know it has coolant and shouldn't freeze but I also know this isn't the same coolant going into a vehicle. I'll bring it inside and let it "thaw" and see if there's still liquid inside the radiator. TIA!