NO POWER TO AC CLUTCH
Several things can cause this. On the inside. The controller could be bad. The wires could be shorted. a blown fuse. Under the hood. Wires could be bad. high and low sensors could be bad. LOW on refrigerant. Engine control module(ECM) could be bad. All of these will cause NO power to the clutch.
SOURCE: freon level full but clutch wont engage
find the reciever dryer you will see a two wire device connected to it, pull it off and install a paper clip in it with enginge off then start and see if the ac cools, if it does replace the switch it just unscrews and is called the low pressure switch.
SOURCE: On my 2007 Dodge 2500
there is no relay in that box that is called the tipm or totally integrated power module. that module is controlled by a computer and should be checked with a scanner to see if you have a code for the a/c. i m having the same problem i have been told it could be low freon but can not get the clutch to engage to check the high and low pressure. Also read where it may be the diode in the clutch on the ac compressor if you have a multimeter probe the compressor a good compressor will read somewhere between 3.5 and 4.0 anything else and clutch needs to be replaced. other possibilities may be the high or low pressure switch on the line. on myh 2006 2500 diesel it is located near the plug for the compressor on bottom side of motor. hope this helps.
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