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Cruise Control 900 1994

I'm about ready to pull my hair out trying to fix the cruise. It works mostly when the car is first started, but quits anywhere from 10 seconds to 10 minutes into operation and won't resume after that. The diagnostic codes all check out properly. The car also quits blowing air out of the dash vents with a slight pull on the engine. This leads me to believe I have a vacuum problem. I've checked all the connections I can find- the servo, brake switch and the T connector. They all seem to hold vacuum. I keep seeing info about the vacuum pump. What/where is it? My car is a '94 940 wagon. Is it the unit the T connector plugs into? Or hidden somewhere else?
Thanks for the help.






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