Answers: the vent controlls are inside the dash they operate on the engines vacuum if you uncap your hood you will find a hose running into the firewall and into the back of the crash
make sure this hose isn't leak if its not then your going to hold to do a little exploratory surgery
by that i connote remove to a/c head and covers below the dash try listen for a vacuum leak any way its probably not going to be expeditious
good luck
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