Search found 17 matches

by billr
Thu Aug 02, 2018 2:04 pm
Forum: Automotive Air Conditioning Forum
Topic: '94 Saturn A/C, need opinions
Replies: 20
Views: 18013

Re: '94 Saturn A/C, need opinions

"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 ...
by billr
Thu Jul 26, 2018 9:51 am
Forum: Automotive Air Conditioning Forum
Topic: '94 Saturn A/C, need opinions
Replies: 20
Views: 18013

Re: '94 Saturn A/C, need opinions

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 dr...
by billr
Wed Jul 25, 2018 8:37 pm
Forum: Automotive Air Conditioning Forum
Topic: '94 Saturn A/C, need opinions
Replies: 20
Views: 18013

Re: '94 Saturn A/C, need opinions

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 ...
by billr
Wed Jul 25, 2018 9:55 am
Forum: Automotive Air Conditioning Forum
Topic: '94 Saturn A/C, need opinions
Replies: 20
Views: 18013

Re: '94 Saturn A/C, need opinions

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 and...
by billr
Mon Jul 23, 2018 3:21 pm
Forum: Automotive Air Conditioning Forum
Topic: '94 Saturn A/C, need opinions
Replies: 20
Views: 18013

Re: '94 Saturn A/C, need opinions

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 the...
by billr
Mon Jul 23, 2018 12:56 pm
Forum: Automotive Air Conditioning Forum
Topic: Soder leak w/out purge
Replies: 7
Views: 7156

Re: Soder leak w/out purge

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.
by billr
Mon Jul 23, 2018 12:53 pm
Forum: Automotive Air Conditioning Forum
Topic: Soder leak w/out purge
Replies: 7
Views: 7156

Re: Soder leak w/out purge

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 suita...
by billr
Mon Jul 23, 2018 10:27 am
Forum: Automotive Air Conditioning Forum
Topic: Soder leak w/out purge
Replies: 7
Views: 7156

Re: Soder leak w/out purge

No
by billr
Mon Jul 23, 2018 9:27 am
Forum: Automotive Air Conditioning Forum
Topic: '94 Saturn A/C, need opinions
Replies: 20
Views: 18013

Re: '94 Saturn A/C, need opinions

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?
by billr
Sun Jul 22, 2018 3:14 pm
Forum: Automotive Air Conditioning Forum
Topic: How much more freon will a system take when vacuumed vs. empty?
Replies: 6
Views: 6902

Re: How much more freon will a system take when vacuumed vs. empty?

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