vacuum?
I'm pretty sure your on the right track. Both cruise and the vents are controlled by vacuum. Start the engine, remove the line to the vac pump, and put your finger on the vac pump. Feel for the suction, if there is suction on you finger it should be OK.
Your on the right track, look for bad hoses, there is a coupling right above turbo that can melt from heat. I would also put vac gauge on pump i dont know for shure but i would asume you should have 10-15 inch off vacume maybee more.
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