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When the clicking happens does your interior lights blink?
When the clicking happen to me i had bad battery connections and the clicking ment i was having a voltage drop.
I would check your battery connections and battery also.
my 01 sierra had noise like that. it progressed until it started coming from bearing on steering column. i could fell it in column, would move about 1/16 inch in any direction. try to see if your column moves.
no its tight it sounds more like a relay of some sort , im thinking ac it does not do it when the heater is on just when the fan and cold air is on !!!