[DML] Clicking noise behind passenger seat when A/C on

["lakelanier20" <derek4567@xxxxxxxxxxx>]

Hello,
I know there have been posts about this before, and I did a search 
but could not really find a good answer.    
I've had my car for 3 1/2 months, and just prior to that the A/C 
system was serviced by DMCH, so I know everthing was ok with it when 
I got the car.  Starting about 2-3 weeks ago, whenever the A/C is on, 
there is a constant (literally about every 5 seconds) clicking noise 
coming from behind the passenger seat.  I can't tell if the cooling 
fans are turning on and off with the clicking noise because I can't 
hear them while driving, but I do know that at night the headlights 
dim slightly whenever the click occurs (not every five seconds, I'd 
say more like every 20 to 30 seconds).  The A/C still blows ice cold 
as it did 3 months ago.  Can anyone tell me if there is a problem and 
how to go about fixing it?  Could it be as simple as a corroded or 
dirty contact somewhere?  

Thanks a lot,
-Derek L
VIN 5302








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