I understand GB - but knowing the Brand and Model of the crockpot he purchased might help in finding recipes provided for that specific make/model. Some have only 2-setting (Low-Hi), some 3 (Lo-Med-Hi) and some 5 fixed setting, or a variable range (not preset). Rival actually has a site with instructions and recipes, in Spanish (included in the lists below).
But - in the absence of that information ... here is a place to look for the results from a Google search for recipes in Spanish for olla eléctrica de cocción lenta
-and- olla de cocción lenta
These should give wildbrian1234 a place to start collecting crockpot recipes in Spanish. With any luck maybe Lugaru will see this thread and jump in with some other sites or ideas.
Don't feel bad ICad - I had to break out my dictionary and try to remember my high-school Spanish before I could find anything. The above translate literally as Pot electric of cooking slow and Pot of cooking slow.