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Comes out of the R/H side of the plenum near the alternator. Runs alone the R/H inner fender, down by the battery box where it gets taped into the wire harness and enters the cabin through the R/H foot well. I lost vacuum to the diverter valve and the system would not switch from vent to heat to defrost. It just stay in one position. In my case the plastic vacuum line was damage by battery acid where the line comes close to the battery box. Easy fix by cutting out the bad section and replace with rubber vacuum hose.
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