If everything has power but no power to ac clutch is that a bad low press switch

Could be several problems. Depending on what vehicle you have you may have high and low pressure switches. If the freon is low, the low pressure will not let the compressor engage. The ac controller could be bad not sending current to the AC clutch. If you have power to the relay, depending on the vehicle, the relay may not be getting a ground signal.

You may have a low pressure switch that is bad not allowing the power to get to the compressor. Also maybe a some bad wiring in the system.

My guess would be either low pressure switch or the relay. Should be in the power distribution center under the hood.

There are 2 pressure switches on it. High and low. Make sure you jumped the high switch. If so, the ECM could be bad. Check wiring first. Low refrigerant could be the problem also.

bad clutch; bad coil in clutch; no power to energize clutch no refrigerant in system and more

Yes, you need to hook up a set of A/C gauges and this web site will help you diagnose your problem, do not buy a compressor till you read the gauges,
http://www.denlorstools.com/autoblog/2009/04/adding-freon-to-car-ac-gauge-readings-explained/

This could be a few things. The freon could be low, one of the switches (high or low pressure) could be bad, or you could have a bad compressor clutch. You can test the clutch by checking for battery voltage and ground at the two pin connector with the A/C on if you have both power and ground, then the clutch is bad. You really should start by hooking up pressure gauges to the A/C ports to check the pressures, and these vary depending on ambient temperature and whether the A/C compressor is engaged or not. I am willing to bet that the freon is low though and may be just as simple as recharging the system.
Hope this helps. Good luck!

CHECK AC COMPRESSOR CLUTCH SHOULD BE ENGAGED OR RUNNING WITH AC SWITCH ON POSITION.IF NOT CHECK AC COMPRESSOR CLUTCH FUSE AND RELAY.IF BOTH GOOD AND POWER IS GOING TO AC CLUTCH.YOUR CLUTCH IS OPEN.IF ALL LOOKS GOOD YOUR AC LOW PRESSURE SWITCH IS BAD.COMPRESSOR SEIZED OR YOU HAVE TOO MUCH MOISTURE IN AC SYSTEM.

if your low on freon the unit will not work.low pressure switch cuts it off. or you have a bad a/c clutch asy.

Fuse #5 is for your ac.

On the Hi/Low pressure switch conection Terminal 1 and 2 are for AC clutch bridge them briefly to see if clutch engage if so system is low on refrigerent.

If you get cold air its more then likely Hi/Low switch is bad.

Note engine must be running and ac fan in on position.

Good luck