Re: 2013 tahoe q4sf
You have to buy what are called "muffs". They look like ear muffs and fit around the outdrive where the water pickup is located to feed the engine water from a garden hose. You can buy them at any marine store and they usually have them at places like walmart and other sporting goods stores.
Once you have fitted the muffs to your drive and you have the water running, you can start your engine and let it run at idle speeds. I was told don't rev over 1500rpm while running on the muffs so I would heed that advice.