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Mine has the same clicking sound when first started (no noise in the car, like the radio). It has always done this since I stopped using the stereo while driving (many many years ago). Have heard of this before, some have suggested it is an electric solenoid behind the glove box controlling a vacuum line. Turning the fan on the first position has stopped that clicking every time. When I start the car and hear the clicking, I turn the fan to position 1 and I hear a 'damper' type noise within the dash somewhere behind the glove box. Bingo, I do not hear the clicking any more (and the car is still quiet). Good luck!


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