After a couple of cold days (8F at night), I went to start my truck to let the engine run for a while. After 10 minutes of running, I looked around and there were no leaks. After another 30 minutes there was a puddle of coolant . I shut the truck off, opened the hood and checked everything and there was no leak there, and my coolant level was not low. Two hours later, I turned it back on waiting to see where the leak might be coming from and there was no leak. I had it running for 2 hours and still nothing, no leak. I’m wondering if this was from the cold weather or if it’s something else. As you can see in the picture there is quite a bit of coolant on the ground.