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Did you use the proper gauges to measure the high side and low side pressures as you added the 134 (I assume not Freon)? If not, it's possible you put too much 134 on the high side and either you kicked a breaker for the pressure or you just burned up the compressor.
You've got some of the picture, but not all of it. You need to know what the high and low side readings are, so yes you do need the gauge set. If the system is charged, and the low side is not dropping below 25psi, I would guess the low side pressure switch is faulty. But if the low side is dropping below 20psi when the compressor stops, the system may be low on freon. Which means you have a leak somewhere. The hissing noise is freon flowing thru the system which could also indicate a low charge.
For best result you may be better off evacuating the system for 30 minutes or more, shut off the vacum pump and wait for 15 minutes to see if the gauge needle goes up? if it does not then add 2-3 cans and make sure you stay between 25 to 45 PSI while compressor on.
If your ac system was r12 and you converted the system to r134a, without pulling the freon or flushing
the ac system, r12 and r134a freon gases will not mix they will gell and clog up your system. good luck!
You have either a bad pressure switch or your system is to low on freon. pressure switch is located near evaporator close to fire wall to check use jumper wire across the 2 terminals if compressor turns on add freon the chances are that the switch is ok. make sure to add the freon on the low side of system and use a gauge on the fill hose (the better fill kits have the gauge on the hose). If you get cold air out the vents and then after a bit it doesn't seem cold you have a leak in the system. Make sure to use the correct type of freon should have a sticker under the hood. I think it should be R-134A but make sure the sticker will tell you the correct type.
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Hope this sheds so light on your problem
Check your fuse for the A/C. If it is okay then you need to locate the low pressure cutout switch and temporarily put a jumper in the connector. If the clutch kicks in, then you need to check the Freon pressure on the oblong black tank or hose directly adjacent to this tank.
Do not run the compressor very long with the bypass.connected or the compressor can burn up. However the compressor must turn to build pressure from the remaining Freon.
If you are lucky the Freon will only need to be topped off. This means the Low pressure switch did its job of preventing damage. Add Freon with a Sealer and you may close the leak that let out the Freon. Some of the gauges are not expensive, and some cans have a one-time use gauge on them.
The low pressure switch can also get weak and shut your system off early. Its a screw off-screw on part and easy to replace. Then if your compressor is noisy after working on this you may need an oil charge. That would mean you had a substantial leak and you lost the lubricant for the compressor. But you may be lucky and get by just by adding Freon.
I wanted to be informative in case the easy steps do not work for you so you can try several things. Good Luck on your repair.
It will be in the yellow section if the compressor isn't running. Go ahead and hook up the gauge. When the compressor kicks on the pressure should drop to below 15 and then the compressor should kick off. Is it doing this? If yes go ahead and add freon. The yellow section means the pressure is high but you only have to worry about it if the gauge reads in the yellow with the compressor kicked on.