1997 Ford Contour Air blend control not working

Thanks for your quick reply. I read that the Contour was same as Mondeo (I'm an american living in Australia) and there's almost no support for the mondeo here--it was a failure in the 90s, with a comeback on new ones.

But I'm not sure we're on the same page. The motor looks like attached and doesn't move when removed, but plugged in. I got a replacement from local scrap yard and both test identically for continuity on the 8-pin electrical connection, so I suspect they're both good (or have exactly the same problem).
Is this the same car we're talking about?
There could be a vacuum leak elsewhere--can hear a faint sound when engine running--like the loud sucking when I had the line off that plugs in near this unit. Can't find it tho, and regardless, this is electrical and should move when selector switch is changed.