When I turn on the AC I get a fairly loud clicking sound that emits from the compressor. I got under the car to listen and it's coming from the compressor clutch when it engages, the clicking stops when it cycles. Since I have not had this car from new I don't know if this is normal. It's fairly loud so I doubt it's supposed to make this noise. Since I have a $100 deductible on the extended warranty I thought I would ask first since I don't want to spend $100 at the dealer to analyze and be told it's "normal". This is on a 05 XLT with 5.4.