My A/C has not been running correctly. I checked the system, and it showed that it was low. I added R-134, and it got cooler, but not very cold. Only about 60 degrees at best. I decided to get a set of manifold guages, since I wanted to make sure I was doing things correctly, and this is what I found.

Static pressure-
Low- 35psi
high- 45 psi(that is not a typo)

System running test- (after 15 minutes of running the system)
low side- 45 psi
high side- 95 psi

I believe the high side should be around 200 psi. If that is correct, then something is way off. There must be a high side restriction. Could this be an orifice tube malfunction? If so, why would it fail, and where is it located? Basically I want to know why it failed, in case it is a prelude to something else going bad. I realize with the system being low to begin with, there is a leak, and I will run dye through it and fix that also.

Any ideas??

 

How are you using the gauges? Try reading with the high side closed at the manfold. Open the high side valve for a couple of seconds then close it. Tell us if there is any difference in the readings. How much frig did you add? WHY DID YOU REPOST???

 

Sounds more like he's running it with BOTH manifold valves open.......

Static pressure must be the same on BOTH sides. That's why it's called the static pressure.

BTW, was this a set of cheap gauges from either interdynamics or Harbor freight? If so, that would explain a lot....

Steve