If you can hear the fan motor running strong, then you have to get behind the dash and readjust the vent adjusting control valves behind the dash, common to old cars the vent tend to fail and when adjusting the vent direction unit fail. being 1991 it will be cables or vacuum line. no book from any automotive store really go into removing dash fixing ac ventilation unit. is a simple fix, but time consuming once you get the dash apart you will be able to identify the problems.
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They are vacuum lines and how do you adjust them?
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