Automotive Air Conditioning Information Forum

"Life got in the way of this project", it will be a while before I get back to it. However, I did make some progress just before the halt. The last time I checked, things were like this:

Ambient temp 78F, static pressure 79.5 psi, humidity 35%
Low/high pressures 23/160 psi at 2000 rpm
Low temp at ...

OK, I didn't understand that "misting" meant flooding with a garden hose. That will make a nice mess in my garage, but I'll do that if/when I get back to testing. I would rather have the water on the floor than replace a compressor that is actually still good.

You asked before about the dryer and I ...

Yes, I understand now that it is fixed-displacement with a cam-plate /port-plate to throttle the intake. I can only wonder how that extra expansion of the fluid through that throttle affects the theoretical thermodynamic cycle.

Somebody pointed out that big adjusting screw on the suction end of the ...

I'm going to post this in a couple of other forums, so a quick recap:

High-side pressure is too high (300+psi), low-side OK

Condenser seems to be working OK, fluid lines cool from about 150F at compressor discharge to near-ambient at drier. Also, I misted the condenser with 70% isopropyl alcohol ...

I am hearing elsewhere that it is a variable-displacement compressor. New info:


I ran new tests today (full data below). At my TXV the top line is larger and colder (39F) than the bottom line (93F).

Which begs a new question: How does that fluid go through the evaporator and come out at 39F, yet ...

Oops, I forgot to address the JB Weld question. Yes, many patch methods can be considered, but there is no sure-cure. Each of these patching situations is unique.

There are two problems. First, pressure leaking through the area you are trying to fill blows any molten metal out of where you want it; and if that fluid blowing out isn't inert, like He, N, Ar, etc, then the joint area gets contaminated and no good joint is possible. I don't know if R134A is ...

No

Am I focused in the wrong direction, blaming the TXV for the abnormally high "high" pressure? Is this a variable-displacement compressor that could be failed in the "full stroke" position and not modulating the flow?

When the system is low, and you can't go by weight added, use the high/low gauges. Does that answer your actual question?