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It is a group of relays controlling when the compressor kicks in according to load, temp, etc. There are DIYs on here regarding diagnosis and fixes, some specifically for the 85s.

(edit) Here's a link: http://www.peachparts.com/shopforum/diesel-discussion/172032-klima-basics-missing-forum.html#post1344819

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth