I have a 1974 240D, and this little guy was connected to the wire harness, but the switch part wasn't. What does this thing do?

Full throttle compressor cutout?

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles

I think it's the blower change-over switch, used on '70 & later W114-115 cars with factory Behr AC. It works off the vacuum-operated air-flap rod, above the accelerator pedal, to switch from heater-blower to AC blower.

Happy Motoring, Mark

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DrDKW

Awesome. Thanks!