2004 chevy Silverado 1500 ac turns on and off. I change the ac compressor clutch, pressure switch sensor.I tried to vacuum and use the ac gauges to check and vacuumed everything closed every gauges disconnected the vacuum connected the refrigerant 134a let out a bit of air till I see green come a bit out then turn on the truck on full blast on then proceed to add refrigerant 134a the low pressure is at 50 and the high pressures is at 100. The ac compressor just stuck turning on and off.
high pressures is at 100
sounds low. If it's cycling on and off, and the the lines aren't cold, then you're probably low. If you're low, good chance you have a leak, which isn't the least bit surprising on a 21 year old truck. Those AC lines corrode, especially under the clamps, and especially if they salt your roads.
You need to put the fluorescent dye in it and check every inch for leaks with a UV light. You won't find pinhole leaks otherwise. They're microscopic and invisible to the naked eye.
What do you mean by "let out a bit of air till I see green come a bit out"? That does not sound like any AC service procedure I've ever heard of.
Did you put in the correct amount of R134a refrigerant specified by the manufacturer by weight? Used pure R134a without damaging sealers or other contaminants?
@chucktobias on the gauges the one in the middle the yellow it has a tiny valve to let out air that was in the yellow hose
Ah, so you purged air out of the charge line, which is what one would want to do in order to keep air from the hose getting into the system. Couldn't tell what was going on though from the description.