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I have a 93 Dakota and back in the summer I had the ac on. When I would accelerate the cold air would go away. When I left off the accelerator, it came back. Thought maybe it was a vacuum leak but have been told that I have vacuum to the back of the dash. Also, I cannot switch from the defroster vents to the dash vents. Had this issue before and the mechanic tore it apart and greased the baffle. Have been told this time that I need a new heater control panel. Anybody have any ideas or suggestions?
 

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Definitely sounds like a vacumn leak. Then of course you could have more than one thing going here... when the vacumn returns (after you release your foot) does the vent then switch? if not- probably a heater control is in the future- could be that is where the leak is.. or these 28+ year old lines are getting brittle..
 
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