You need the proper gauges to do any diagnostics on an a/c system...to do any work on them, you also need an evacuation pump as well as experience. That's the facts!!! I believe that 93 was the cut-off year for r12...mine has r12 in it. Unless yours was made for 134, or was properly converted I wonder how you managed to put 134 in there? If converted, it works but never as well as the r12 did...later systems got a bit better though. If the unit is cycling frequently it could be from a leak. You will need dye and an evac pump to determine if and where, as well as gauges to tell you if there are any obstructions in the system. In your case, guessing can get more expensive than just having a good shop look at it. I know that's not what you wanted to hear but it's true.
A/C leaks are sometimes hard to find. I have a 93 Grand Cherokee as well and mine also has R134-A. I recently had to replace a leaky line on my A/C system. Fact is, they are getting a little older and things like seals and rubber lines are going to fail from time to time. If you replace the compressor it is also a good idea to replace the accumulator (or dryer). On the 93 Grand Cherokee, replacing the dryer also replaces two of the rubber lines as they are part of the dryer assembly. You should have a good shop troubleshoot it for you if your not familiar with A/C systems, their components and how they work.
Yes..
When doing the compressor - the dryer needs to be replaced too..
Hope this helps !I
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