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Old 10-15-1999, 09:12 PM
mbdoc mbdoc is offline
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
All of the A/C control are vacuum actuated. The heat from the outer vents are because the heater valve isn't shutting off. The clicking noise is the vacuum control behind the right dash receiving signals to change vacuum elements. If there are any vacuum leaks in the system this will happen.