On these websites you find fuse box diagram, description and location for Chevrolet Astro (1997)
Chevrolet Astro 1997 fuse box diagram Auto Genius
Chevrolet Astro 1997 fuse box diagram
I am not sure if you are asking what these two fuses go to, or if you are trying to ask what amperage to install. I believe I'll need to know if you've looked on the inside of the access panel to see if there is a diagram for you. Sometimes there is a booklet in a pocket. But since your astro is 13 years old, it is probably missing. Please let me know what exactly your question is.
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