Mercedes climate control amplifier unit made by VDO. Mounts behind the glovebox compartment and, if it goes bad, causes the heat to stop working (doesn't actuate the servo). Condition appears excellent, but sold in untested condition. Made in Germany, 1987 manufacture date.

Part numbers:

000 835 01 57

412.204/001/001

There are a few of these on eBay, all are over $100.

Free shipping in the USA. International is an additional $9.