It's an electrical issue as I've been trying to get to the bottom of mine for a while. I have a new switch, blower, actuators, actuator motors, compressor, accumulator, etc all new in my truck. The ac turns off on its own and back on by itself. It even affects the switch for the heated mirrors. After I installed my new ac system, I then connected my Autel shop scanner to my truck to try to pinpoint the issue which is electrical. I'll be more than happy to share what it is once I find the exact problem
SOURCE: 2006 dodge ram diesel a/c quit comprssor clutch
I have the same truck with the same exact problem. Mine also stopped blowing while pulling a camper and indeed it is the clutch on the A/C. I was told if you can find someone in your area that can actually rebuild the compressor and not put a new one in you can come out alot cheaper! Also if you crank your truck and turn the A/C on look under the truck on the passenger side at the compressor and take a tool of small hammer and tap the compressor in the middle and it should come on and run the a/c for a little while! I did this until it finally went out and it worked! Might buy you some time!
SOURCE: 2004 Dodge Ram 2500 air conditioning
It sounds like your electronic vent actuator has gone bad, it's common to go bad and may need to be replaced. There are tinny gears that wear out and the vent actuator stops working. You can try this, turn the radio off first so you don't have to enter the reset code to activate your radio. Disconnect the battery for 30 seconds and reconnect it, if the actuator has lost it's base line and stuck in the open heat position, this will reset it, just make sure the setting is to cold and off before disconnecting and reconnecting the battery. If this does not work, then it's a bad actuator and Auto Zone should have the part you need and will have the step by step instructions for you to the job you self, I believe the dealer is a $415,00 repair cost for this. Good luck and keep me posted.
SOURCE: What should the high and low side freon pressure
The re-fill kit for the r-134 will only fit on one of the sides. You want to fill the low pressure side, but be sure you have a gauge not to overfill. he high pressure will be the larger side. But the gauge will only fit on one of the inlets for safety precautions.
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