behind the radio on passagerside theres a connector with several vaccum line on it, check and see if they are all connected, that happened to mine and it turned out one of the lines came off. good luck.
Start the car and see if that black line has a vacuum on it. If not then go to then engine bay and look were I suggested. Also look on the vacuum tree. there is a port label A/C on it. Thats for the A/C vent controls.
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