It sounds like it could be the water pump, but to be sure you need to get under the truck with a flashlight to confirm. this guide can help and I have left instructions on how to change the pump out in case you need it in the images below.
https://www.2carpros.com/articles/car-is-leaking-coolant
Check out the images (below). Let us know what happens and please upload pictures or videos of the problem.
Images (Click to enlarge)
Jan 5, 2023 at 9:48 AM