Automotive Air Conditioning Information Forum

After a couple of cross-checks, both sources to which I have access say the same thing: 28 ounces net weight of R-134a, and 4.0 fluid ounces of PAG-46.

Incidently, what are the year, make, model, and engine size of your vehicle? I don't recall your mentioning those.

Does your vehicle have an under-hood decal showing the A/C specs? If so, post them here. If not, I'll see whether I have them.

I've seen blown cases before involving different compressors from yours.

Depending on the size of the leak (minimal), you probably could've left well enough alone and avoided all the trouble as long as the outer cap held pressure without leaking. (See the recent topic in the Forum about that ...

Life happens. We will get back to you sooner or later, although I must admit that I'm having some difficulty following your thought process given the length of your original post.


When I was a sole proprietor, I got by with vacuuming to 30, let sit a few hours and check for needle drop, spray out ...

Not being disagreeable, just adding my two-cents worth to the conversation.

I have never experienced a leaky metal or plastic service-port cap.

That said, modern materials and designs have undoubtedly improved on the lowly plastic cap, its durability, sealing abilities, appearance, and ...

Sorry about the delayed response.

IMHO, cycling the variable-displacement compressor (VDC) controlled by a reprogrammed ECM (from the 2015 GMC Sierra 1500) by means of a pressure switch installed in the low-pressure line just won't work. Furthermore, powering the electronic control valve from the ...

How can we help you with the 2001 Excursion? A simple question or two would be a good start.

Dwight, You didn't mention the year, make, and model of the truck the A/C system came out of, or whether it called for R-134a refrigerant. Did the LT engine also come out of the truck? That will help us diagnose this.

For the moment, I'll take the liberty of "presuming" that this system uses a GM V ...

Thanks for clarifying.


I repeat the readings. When outside temp is around 72 F, car is not running and been sitting for at least 8 hours, pressure is around 73-74 psi on both sides.
So the static pressure is 73-74 PSI.


With car running, low side is around 28-29, and hight side 100-110 psi ...

In the video of your Manifold Gauge Set, it sounds to me like the engine is idling. If so, bump-up the engine speed to about 1,800 RPM, and retest the pressures. Otherwise, according to the Vintage Air specs, the system appears to be fully charged and operating normally.