Noise from A/C After Dirty OffRoad

[mav2k]

My A/C is making this noise that I can only describe as a fast click, like the noise you hear from a computer when it is processing something. This noise comes from the passenger side. It happens aftert I come from the Beach, I Drove in Dirty OffRoad.The A/C for the back seats is Ok No noise. When I use the A/C Recicly mode I get More Noise!! When I turn off the A/C but Fan to full Speed No Noise.
Any Suggestion? A/C Filter?

 

[bojans]

Mine did that for a while, had the dealer check the blower motor and there was, what I can only describe as a molding fragment hanging on the fan blade that was clicking as it spun. Only heard it at low fan speeds. As the dealer to check it out.