Upper Plenum removal problem & Stickers question

[93LSPssp]

Also, has anyone else ever removed a thermacter air pump which was perfectly free in movement and then have it freeze up on the shelf?

The one on my 78 LTD 460 PI did it but I assumed it was because it sat on a shelf (indoors) for almost ten years.

I removed this one to restore it barely 5-8 weeks ago and it has also frozen up.

Perplexing.

I mean, it sits on the car (Mustang) in the yard for almost seven years, going very long periods between starts of the engine and it never froze up under THOSE conditions. I take it, clean it and restore it & box it up on the shelf and it seems it is froze solid in less than two months. Go figure.

I suppose I will have to disassemble it now and free it up. That's what I had to do on the LTD.