Could be that vac tubing, like the standard wiring harness, are put in all vehicles. (some techie may know for sure.) The vac pump is required to run the air conditioner.
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Gordon Ford
O4 F-350 Supercab 4X4 (Stock)
06 Nash 21-5R fiver
51 Ford 8N, 2452 Bayliner, and too many more toys
