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A/C leak detector,,,?

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desertjoe View Drop Down
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    Posted: 27 Apr 2018 at 10:43am

Howdy,,,,,,I got a very small leak on the A/C on the 92 Ranger that I just cannot find to repair it. It will take bout a week to leak bout a can of the R134. What is puzzling is,, I evacuated the system to 10" and it held there for bout 3 hours before I added 1 1/2 cans of Freon. It leaked out after a week. I have added 2 different kinds of detector but it never shows up where I can see it.
What do others use for detecting,,,??? Thanks
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Stan IL&TN View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Stan IL&TN Quote  Post ReplyReply Direct Link To This Post Posted: 27 Apr 2018 at 11:58am
Push it in the river and look for bubbles?  Sorry I could not help myself.  I'll sit on my hands now.Stern Smile
1957 WD45 dad's first AC

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Post Options Post Options   Thanks (0) Thanks(0)   Quote sho-man1 Quote  Post ReplyReply Direct Link To This Post Posted: 27 Apr 2018 at 1:05pm
Schrader valve leaking?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 27 Apr 2018 at 1:13pm
I have bought a couple cans for Freon with the SEALER mixed into it... Im not a believer in SNAKE OIL, but was at a loss of what to do next when in your situation.. Now I add 1 can per year..  Seemed to help quite a bit in MY situation.
Like them all, but love the "B"s.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote desertjoe Quote  Post ReplyReply Direct Link To This Post Posted: 27 Apr 2018 at 5:57pm

OK,,Stan,,,,,,Say,,,you got an idee where I might rent a scuba outfit,,,,???
Hey Sho-Man1 that's a great idea,,!!! Actually,,,there is a shraeder valve on the high side that points straight up and was full of gookies and I dug around it with my knife,,chit,,I mighta messed it up,,?? Gonna go put another can of Freon in the trk and check Both of the shraeder valves. I wonder if those are the same as the valves on trk tubes,,??
Hey Steve,,you remember what brand of leak sealer you used??
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Brian Jasper co. Ia View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian Jasper co. Ia Quote  Post ReplyReply Direct Link To This Post Posted: 27 Apr 2018 at 7:08pm
Don't do the sealer. It's all done if you ever open it up. A system out in a week has a pretty big leak. Any halogen style detector should find that one. As someone else said, you can get a can of 134 at Wal-Mart or any parts store with UV dye in it. After it's leaked down, go over it with a black light. It will show up bright yellow with a black light.
"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shameless dude Quote  Post ReplyReply Direct Link To This Post Posted: 27 Apr 2018 at 9:18pm
I agree with Stan's idea! I drove my 3/4 Chevy today, hit the AC button and was basking in nice cold air all day. I haven't touched the AC since I bought it 3-4 years ago. (it's a '98). (poke,poke,poke)
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desertjoe View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote desertjoe Quote  Post ReplyReply Direct Link To This Post Posted: 27 Apr 2018 at 9:43pm
Originally posted by shameless dude shameless dude wrote:

I agree with Stan's idea! I drove my 3/4 Chevy today, hit the AC button and was basking in nice cold air all day. I haven't touched the AC since I bought it 3-4 years ago. (it's a '98). (poke,poke,poke)


UMMmmmm,,,,Shameless,,,,how long did you have to leave your trk in the river before the leaks sealed up,,,????? poke (back), poke (back), poke (back),,,,,

Naw,,Brian,,I wasn't really wantin to use any of thet sealant stuff cause I've heard lots of bad chit bout thet stuff even pluggin up the orifice tube,,,
But ole Sho-man1 may have just figured this out for me with the low side shraeder valve being the culprit. I went out there and sure enough the top of the accumulator has that wet gritty look to it from the Freon leakin down on it. Hooked up the vacuum pump back up and it pulled system down to 15" vacuum before quick could get ready. Gonna leave it there til in the morn and see what I got.

Edited by desertjoe - 27 Apr 2018 at 9:43pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shameless dude Quote  Post ReplyReply Direct Link To This Post Posted: 27 Apr 2018 at 9:51pm
I gots a sharp corn knife, I could trim up some of them hoses for you!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote HudCo Quote  Post ReplyReply Direct Link To This Post Posted: 27 Apr 2018 at 10:18pm
if you cant pull a vacuum down to 24 inches and hold it for 24 hours you have a leak.   10 inches for three hours is a bad leak should not be hard to find with a shot of dye and a uv light or just a leak detector
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shameless dude Quote  Post ReplyReply Direct Link To This Post Posted: 28 Apr 2018 at 1:21am
my mechanic has a little beeper thingy he checks lines and the system with
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Post Options Post Options   Thanks (0) Thanks(0)   Quote desertjoe Quote  Post ReplyReply Direct Link To This Post Posted: 28 Apr 2018 at 2:51am

   uploads/10257/Screenshot_109_2018-04-28_02-48-19.png" />

Hey Guys,,I've read about this type testors and wonder if they are worth spending money on,,,? What ya'll think,,??
You'ld almost have to be inside a shop as I think any wind would not allow good results,,??

Edited by desertjoe - 28 Apr 2018 at 2:53am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dipstick In Quote  Post ReplyReply Direct Link To This Post Posted: 28 Apr 2018 at 5:30am
Joey those valves ARE regular Schrader valves from tire valves!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fixer1958 Quote  Post ReplyReply Direct Link To This Post Posted: 28 Apr 2018 at 6:51am
Is your accumulator made out of steel Joe. If it is it may have some rubber type insulation crap covering the majority of. Peel it back and look at it. The accumulator may be rusted
and full of holes.

I use UV dye myself.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JW in MO Quote  Post ReplyReply Direct Link To This Post Posted: 28 Apr 2018 at 2:52pm
That sealant stuff WILL eventually plug up the screen or orifice in the expansion valve.  If air gets in the system I have seen that stuff build up, get hard and at first I thought it was a pencil in the system, not to mention stink to high heaven.  The only leak detector I use or recommend is a  H10, made by Mars, Bacharach, or GE.  I personally use the 110 volt version, but they also have battery ones.  For leak checking, I use Nitrogen at a pressure of 110 to 119lbs for a minimum of 3 hours, these pressures are much easier to see a leak on the low side gauge.  If the leak is hard to find you can split the system and start checking each section by sealing it off.  Now for vacuum, inches of vacuum = spit.  I change oil in my vacuum pump after every evacuation, I spend a lot on oil but I also pull my systems down to 50 to 100 microns.  For automotive I would recommend 350 to 400 microns, bear in mind, atmospheric pressure is 760,000 microns, at 10" vacuum, you are still at 760,000.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote LouSWPA Quote  Post ReplyReply Direct Link To This Post Posted: 28 Apr 2018 at 3:01pm
JW is spot on! for what its worth, the more common leak is Schrader valve, and the O ring seals between connections.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shameless dude Quote  Post ReplyReply Direct Link To This Post Posted: 28 Apr 2018 at 9:09pm
don't you have a big ole nose? gits down there and sniff! (poke,poke)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote desertjoe Quote  Post ReplyReply Direct Link To This Post Posted: 28 Apr 2018 at 10:48pm
Originally posted by shameless dude shameless dude wrote:

don't you have a big ole nose? gits down there and sniff! (poke,poke)


Hear,,,Hear,,,that's enough of thet chit,,,,(I done tried thet chit),,,,,
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Post Options Post Options   Thanks (0) Thanks(0)   Quote LeonR2013 Quote  Post ReplyReply Direct Link To This Post Posted: 29 Apr 2018 at 7:56am
Joe the easiest way to find the leak is to pressurize the system, then spray everything in sight with Dawn dish soap and water. Of course there will be some places you can't get to so it might be you would need a tester in those cases The schraeder valves are different. They will physically fit but the little piece that sticks out of the middle is shorter on the valve stem ones, so your gauges will not depress them, not will anything else using this kind of port. You need to pick up the special tool to remove or tighten them because one that fits a car tire for instance isn't long enough to reach the valve. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dakota Dave Quote  Post ReplyReply Direct Link To This Post Posted: 30 Apr 2018 at 9:19am
J use the florescent die and a black light. If you can't find it with that I change the compressor dehydrator and expansion valve. It's sometimes hard to find a leak at the ompresspor shaft seal and the other arts are required any time you change it
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jaybmiller Quote  Post ReplyReply Direct Link To This Post Posted: 30 Apr 2018 at 2:27pm
Did you test WITH the engine RUNNING ??? OK, maybe that sounds daft BUT vibration can 'loosen' up and O-ring seal and pisssst , there goes $100 of freon.
I learned that on an 88 Aerostar, idiot engineers at Ford replaced GOOD fittings with cheap aluminum and 2 o-rings...only took 1 to fail to lose the gas...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian Jasper co. Ia Quote  Post ReplyReply Direct Link To This Post Posted: 30 Apr 2018 at 9:28pm
Those spring lock connectors weren't the smartest idea. They did make them easy to assemble on the line, but like you said Jay, they leak. The green rings helped but those systems weren't long term leak free no matter what.
"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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Post Options Post Options   Thanks (0) Thanks(0)   Quote copyrite1972 Quote  Post ReplyReply Direct Link To This Post Posted: 02 May 2018 at 9:50pm
When I wants to check my AC for leaks, I parks it onna' clean concrete slab, and come back inna mornin'! LOL
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