a/c problems

I have a 1997 Dodge Ram 1500 4x4. For some reason my a/c won't work. It's full and charged the compressor comes on but will then turn right back off i think it might be a relay can someone help.

It may be plugged. If the system has a restriction, pressure will build very
quickly and the compressor will shut off.
It is common to have a restriction in the accumulator.
You should let a shop check it out, you dont want to mess with the pressures
in the a/c system.

I have dealt with this, sounds like the a/c low presure switch on the accumulator could be bad. You can check this by unplugging the harness to the accumulater and jumping a wire across the 2 leads on the harness. if the a/c pump stays on then it is a pressure problem, and likely it is the switch. If you have dealt with a/c then you could do it yourself, but if not I wouldn't recommend it. Like the post said before me, you should let a shop do it, unfortunately it is expensive. That is because whenever they work on a/c they have to test run tests to make sure people have not put propane or stop leak stuff in it, which will ruin their equipment. Anyway, not a big problem, just cost you a little.

ps. download the service manual for genII ram on the main thread site it will help you understand

How many lbs. of refridgerant did you put in the system? How many ounces of oil? Did you remove anything from the a/c system that could allow air into the system? It is possible that the orifice tube is plugged, but you must hook the vehicle up to a recover/recycle machine to change it. If you have to replace it, don't just let the refridgerant out into the atmosphere. Even though the Fed. Gov't says it's non-toxic, you never know. Remember when we though R-12 and other CFC's were safe? Hooking up a set of guages will also tell you the condition of the orifice tube. You'll have a high high-side pressure, and a low low-sie pressure. If both low and high pressures are high, you've either overcharged the system with refridgerant or oil. If both pressures appear normal, but the system doesn't cool, you could have air in the system.