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Hello and thank you for your question,The most common cause for your AC clutch to not engage providing the system is full and the Freon pressure readings are okay is caused in most cases by a failing CCRM ( Constant Control Relay Module). Before you consider replacing it you should check the signal in and out of it. I have enclosed the steps in the link below to do this.https://dl.dropboxusercontent.com/u/104923897/CCRM%20Jul%2011.pdfRun the test steps and I suspect your going to find the CCRM has failed . Post back if you have more questions and or need more help.
Okay did you check the signal in and out of it as shown in the steps I sent you?
If not then that the next steps.
Yes Thats what Im saying start with step 2 through four and lets see the results you find. Start fist with making sure you have power in and out of the AC pressure cycling switch on the pink and dark blue/yellow wire from fuse 6.