Hi everyone! My ac stopped working a few weeks ago and I've been working on repairing it. I've replaced the drier and compressor, all the old seals, and the low pressure ac switch. I've also recharged the system with new refrigerant, the low side reads 50psi and the high side reads 100psi, I'm located in Phoenix, AZ area and its about 110 degrees F outside too. When the vehicle is on and idling with the highest fan setting, max ac, and coldest temp turned on, the ac compressor clutch cycles on and off everything few seconds, and the engine rumbles with a clicking noise.

 

Pressure chart here: https://www.acprocold.com/wp-content...rt-33776F1.jpg

You High Pressure side is too low so its turning off compressor, with outside temp above 100degF it should be pushing 300+psi

Did you add oil to new compressor?
What brand is new compressor?

AC doesn't have a "temp setting", its only on or off, compressor is either on or off, it cycles because pressure is too high or too low, and that is normal, but in your case its way too low on the compressor side of the system
The temp **** send air around heater core(COLD) or thru heater core(HOT) or anywhere in between, just FYI, that's how all AC systems work, on/off, no in between


AC is very easy on how it works
When you compress something, anything, it heats up, that's stored energy, when you allow it to decompress it cools down.....fast
If you have ever had an air compressor you will know it gets HOT, but when you release some air its COLD, WTF???
And thats AC, in your vehicle, house, frig or freezer, it all works the same way

A refrigerant is used instead of air because it stores and releases energy better
Compressor compresses it, and some of it turns to a gas
Condenser allows it to cools a bit turning any gas into a liquid
Its then stored in receiver/drier
(because when this HOT compressed liquid is released temp can go below 32degF, so ANY moisture(water) could freeze and block the system, the Drier absorbs any moisture, but it can only absorb so much, so anytime you expose the hoses and parts to outside air for longer than a few days you should always replace the drier)
From the receive/drier the hot liquid goes into Expansion valve
where its Released into the Evaporator, the part in the heater box that cools the air passing thru it from the blower/fan
Then the low pressure cool liquid goes back to compressor
And it all starts over again

Simple diagram here: https://i.pinimg.com/originals/6b/8b...2a6f6f53ea.jpg

Your High side, compressor to receiver/drier, is not getting High enough, so could be new compressor issue

 

Thank you for your reply!
How can I adjust the high pressure? Do I need to redo the charge?
The compressor I got is part of a UAC brand kit, at this link: I followed a youtube instructional video: And ordered the same kit he used, except I did not replace my belt. From the youtube guy and product info, I thought the compressor came pre-oiled...now I'm nervous that could be my problem... Could the oil, or lack of enough oil, be causing the compressor not to generate high enough pressure?
I appreciate your help!

 

You are there, so hard for us to just guess

Could be system is overfilled, compressor may have too much "freon" in it, so can't work well
Could be just a bad compressor out of the box

Could be the condenser is clogged, longshot

I know you just want there to be an answer as to why High side is low, but there isn't, even a 30 year AC guy wouldn't know "why" just off the bat without looking at the system
Sorry