Went to a local HD an hour ago, and sure enough, it was simple as cake. Popped the fasteners out, slid the box out, and the hose was completely gone. Disintegrated. Missing.

I bought some thin H/C PEX pipe to try and use, but unfortunately, it didn't fit. Luckily, I splurged and bought a few feet of pipe insulation as well (self-sealing). While the insulation didn't quite fit 100%, it connected the two pipes together well enough. I'll get home and duct-tape it, to ensure a tighter seal, since right now I doubt it's sucking in much air.

Does the W123 have a motor for the sensor? I thought the pipe just sucks through the underside of the main blower motor?

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(Oo{=|=}oO) 1983 MB 300D USA, 212,000mi. 80's yellow/white. "Gunther"
(Oo{=|=}oO) 1984 MB 300D Euro, Turbo Added in Germany, 186,000mi [SOLD] Missing her dearly.
(Oo{=|=}oO) 1984 MB 300D USA Turbodiesel, 269,000mi. [SOLD]