I have a 2002 Ford Taurus and recently it has not been cooling and I've noticed a clicking noise when the air is turned on. Any ideas what might be causing the clicking sound? I had the compressor replaced last summer.

 

For starters, sounds like system is low on refrigerant. Depending what is found refrigerant can be added to locate cause or area of leak, but proper repair should be done to prevent reocurrence. hanky