Had no AC a few weeks ago so I bought a can of R134a. Whole can and the compressor would cycle on and off, but never on completely or cooling. I did this with a total of three can with same results. Pressure gauge on tool never read over 35 40 lbs. On the last can thought I saw the oil sealant leaking out the side of the compressor between the two halves. So it appears I need a new compressor. What else should I change? Orifice valve, Accumulator? (These three are sold as a kit on Rockauto) anything else I should consider? Truck has about 170,000 mile on it. Thanks for the help.