Where is the EGR on a 2002 astro van?

its next to the thermastat

but you'll have to remove the air duct, the upper radiator hose, and this type support metal thing which helps support the air compressor to the engine

make sure you release the plastic tab on the e. g. r. electrical connector with a vere small screw driver, wiggeling to help it off

than just 2 -10 millimeter bolts

you may want to get a new gaskett too, clean both surfaces first.