how to get a stray kitten in the wheelwell of a car in a garage to come out?
Even though there is no possible way for them to be able to get back into your house, you could just leave the door open and let them run around. This will give them enough exercise and outdoor time that they will not be so bored and wanting something to do inside your home.
If it’s too cold, don’t try this method unless you have an enclosed porch or covered patio. They may make their way inside through any small openings like doors or windows but can’t be expected to survive much longer if temperatures drop below freezing. If the weather conditions are right, release them from confinement with some food and water; then go about making plans for additional shelter indoors (and possibly temporary fencing). Once they’re spayed or neutered (if old enough), return all four cats together: one male-female pair plus two females (with kittens) left behind at the original site, plus another female who should have been brought home along with her mother/siblings when she was still young enough for proper care by humans – perhaps three months old, which would put her age range between six months & 1 year old at arrival. In other words one cat leaving on its own would need help getting established while being cared for by humans instead of being returned only after catching up with an older sibling who has remained outdoors since birth yet is also now ready for human foster care!