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I can only think of one reason you would have the vacuum pump and that is because you have a diesel engine in your caddy. The Oldsmobile diesels they used in these cars had vacuum pumps located in the rear of the engine in the same location you would expect to see a distributor. The vacuum pump was used to operate the cruise control and the climate control system. It also released the parking brake when you moved the shift lever and provided vacuum to the transmission.
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