Andar means to move or to work. El auto anda bien (the car runs/moves well) Las cosas andan de maravilla (things work/move wonderfully) Este computador no anda (this computer does not work) Also, "andar" can refer to one's business. ¿En qué anda, Cristóbal? Ando vendiendo libros What are you up to, Cirstóbal? I am selling books. "Caminar" only means "to walk". Caminamos por el parque esta tarde (we walked on the park this afternoon) Now, I have heard Mexicans using the verb "caminar" (to walk) referring to a car's moving, which is not very natural to me, but Mexican Spanish has certain influences that the rest of America does not seem to have. I hope this helps you.

¿cual es la diferencia entre andar y caminar?

Te copio un poema de ANTONIO MACHADO, para tu deleite Caminante, son tus huellas el camino y nada más; Caminante, no hay camino, se hace camino al andar. Al andar se hace el camino, y al volver la vista atrás se ve la senda que nunca se ha de volver a pisar. Caminante no hay camino sino estelas en la mar.