AC/fan switch

[dmjlambert]

Here is a top down view of the high speed relay from another discussion. Where the arrow is pointing is where a thinner 18 gauge orange wires should be plugged in; that thin wire comes from the blower speed switch. The 12 gauge orange wire you can see in the picture and that comes from the (normally CIG position) fuse panel.

That thread mentions another reason the high speed relay may not be coming on, the thin orange wire was not plugged in to the high speed relay. And finally the AIR COND fuse may be blown, there's another thing to check.