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The next time you hear the "click", completely turn off your climate control system ... no fan .... no A/C .... nothing.
Then listen to find if the "click" ceases. If it does, then you have joined a club with many members; it is most likely an automatic, pneumatically operated vent damper which is cycling open and shut repeatedly.
If so, this problem has been discussed on the Brick Board several times; a search of the archives should produce several entries.
Let us know.
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Dave in Virginia; 98 V70 T5(M); 98 V70; 88 245 DL; 67 MGB
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