The only pods that were different for 1986 to early 1987 were the footwell pods... early type has two round pods, but from mid-87 onward there was a single rectangular pod. All the other pods in the system are the same from 86-95.

The recirc flap does indeed default to full open with no vacuum. It is controlled by a pair of dual-chamber pods in parallel, and if either one leaks, it may not close properly. The "large lift" section will close it about 90%, and when the large lift AND small lift sections operate together, it will close 100%. You can't access either of these pods without pulling the dash. Click here for photos, look at the last three photos in the directory... you can see how buried they are. Even with the dash out they're a pain to access.