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The vents are operated by vacuum motors. You have a vacuum leak, most common place is at the reservoir behind front bumper
 
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Could be the vacumn ball located under the front bumber or one of its lines. I think that vacuum may control the blend door.
 

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Discussion Starter · #23 ·
There is supposed to be a black ball vacuum reservoir black balI thing i guess in the pass side bumper area but that component is not there. There is no ball or lines. Thinking about opening foot well area and see what's in there by firewall. But if this component you mention is missing, will there be anything else im firewall area that will fix problem? Thanks
 

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My friends 94 Xj with the 4.0 has the ball in the same location on the pass side behind the bumber. A trip to the junkyard will fix you up probably. I'm not sure if there is a work around or not.
 
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