Hello and welcome to just answer. What year is your PT Cruiser?
Ok, the 2007 PT Cruiser does not have an ac clutch relay. The ac clutch is powered up by a high side electronic driver inside of the TIPM (under hood fuse box). If you are not getting power to the ac compressor clutch, then you may have a failed low pressure cut out switch, or a failed TIPM.
I hope this information helps, and let me know if you need further assistance with this.