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does AC leak stop work? [message #175646]

Thu, 05 July 2012 15:57

hertfordnc

Messages: 1164
Registered: September 2009
Location: East NC

Karma: 0

Senior Member

Products designed to stop leaks in exhaust and cooling systems are generally a waste of time, right?

What about Air conditioning? The revocn has a slow to moderate leak- or a whole bunch of little leaks.

I shot a bit of duracool into it- not running, it was 15psi.

A day or so later it was 5 psi.

So i figure if the leak-stop stuff works at all, then this might be a good candidate.

Dave & Ellen Silva Hertford, NC 76 Birchaven, 1-ton and other stuff Currently planning the Great american Road Trip Summer 2021 It's gonna take a lot of Adderall to get this thing right.

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Re: [GMCnet] does AC leak stop work? [message #175647 is a reply to message #175646]

Thu, 05 July 2012 16:05

ljdavick

Messages: 3548
Registered: March 2007
Location: Fremont, CA

Karma: -3

Senior Member

Dave,

I'd be inclined to shoot some dye in there and try to find out where the leak is. If it's localized then you fix that and not have to rely on snake-oil (which really works!)

Larry Davick
Fremont, California
The Mystery Machine
'76 (ish) Palm Beach

----- Original Message -----
From: "dave silva" <admin@oldrv.net>
To: gmclist@temp.gmcnet.org
Sent: Thursday, July 5, 2012 1:57:27 PM
Subject: [GMCnet] does AC leak stop work?

Products designed to stop leaks in exhaust and cooling systems are generally a waste of time, right?

What about Air conditioning? The revocn has a slow to moderate leak- or a whole bunch of little leaks.

I shot a bit of duracool into it- not running, it was 15psi.

A day or so later it was 5 psi.

So i figure if the leak-stop stuff works at all, then this might be a good candidate.

--
Dave & Ellen Silva

1972 Revcon Olds 455, toro drive train. All Stock

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Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy

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Re: [GMCnet] does AC leak stop work? [message #175649 is a reply to message #175646]

Thu, 05 July 2012 16:12

emerystora

Messages: 4442
Registered: January 2004

Karma: 13

Senior Member

>
>
> I shot a bit of duracool into it- not running, it was 15psi.
>
> A day or so later it was 5 psi.
>
> So i figure if the leak-stop stuff works at all, then this might be a candidate.
Dave Silva

You can't tell anything without it running. 15 psi put into it could easily equalize to 5 psi once it spread throughout the whole system and to both sides of the compressor.

Fond someone who has a vacuum pump and evacuate it. Turn off the gauge valves and note the vacuum on the gauge. Wait overnight and check again. If it goes up then you have a leak.

Emery Stora
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Re: does AC leak stop work? [message #175650 is a reply to message #175646]

Thu, 05 July 2012 16:16

Carl S.

Messages: 4186
Registered: January 2009
Location: Tucson, AZ.

Karma: 13

Senior Member

Dave,

I'm sure opinions may vary on this, but I had a bad experience with it. I had a leak I couldn't seem to stop on my Jeep Cherokee. I was in the early stages of the learning curve on AC, and didn't seem to be able to get the O-rings in right (I think). I called Bennet Cycle Supply and he said he had a stop-leak/seal conditioner for Duracool. I put a can in the system, and it leaked down anyway.

This spring, when I was trying to get the AC going again, I replaced the expansion block and the receiver-dryer, and tried to pull a vacuum. It wouldn't pull down, so I decided to try a can of Duracool. It all came out the front seal in the compressor almost as fast as it went in.

I was pretty sure the Sanden compressor was still OK, and I found a local auto AC shop where they could replace the seal for me. When I went to pick it up, the guy said the seal was all swollen up and it pretty much popped out the front of the compressor. When I mentioned the stop-leak, he replied that's what, most likely, caused it to do that.

I reinstalled the compressor and evacuated the system, charged it with the proper amount of Duracool, and it has been working great ever since. Your best bet is to track down the leak and fix it properly in the first place. You can even get the hoses rebuilt, rather than trying to find probably non-existent new ones.

Carl Stouffer '75 ex Palm Beach Tucson, AZ. Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member

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Re: [GMCnet] does AC leak stop work? [message #175668 is a reply to message #175649]

Thu, 05 July 2012 17:26

hertfordnc

Messages: 1164
Registered: September 2009
Location: East NC

Karma: 0

Senior Member

emerystora wrote on Thu, 05 July 2012 16:12

You can't tell anything without it running. 15 psi put into it could easily equalize to 5 psi once it spread throughout the whole system and to both sides of the compressor.

Ok, I'll check the pressure again. I have vac pump. And I'll avoid the leak stop.

Thanks

Dave & Ellen Silva Hertford, NC 76 Birchaven, 1-ton and other stuff Currently planning the Great american Road Trip Summer 2021 It's gonna take a lot of Adderall to get this thing right.

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Re: does AC leak stop work? [message #175672 is a reply to message #175646]

Thu, 05 July 2012 17:57

g.winger

Messages: 792
Registered: February 2008
Location: Warrenton,Missouri

Karma: 0

Senior Member

Don't Do it!!!,,,on one forum(Cadilac power?) some one posted his experience. Can't rmember if if stoped the leak for awhile or not. But some time later it leaked down and he didn't repair it. It seals when it comes in contact with H2O,,,moisture,,,water vapor. So the instant you go to fix corectly,,,, it plugs up everything!!! A small amount of humidity when you change a hose,,,expansion valve or an O ring,,,,very bad. He changed it all. Imagine changing everything!!! Condensor,,,,Evap,,compressor and all hoses and the filter/dryer. Everything. good luck,,,,PL,,,oh I have a AC hose crimper for ac hoses. Swing by the state of Misery,,,really,,,Misery,,,108 seven days strait,!!!(missouri)

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Re: does AC leak stop work? [message #175682 is a reply to message #175646]

Thu, 05 July 2012 18:40

roy1

Messages: 2126
Registered: July 2004
Location: Minden nevada

Karma: 6

Senior Member

Find the leak and fix it. The most likely places are o rings, rubbing parts, porous hoses and compressor shaft seals. Very often the longest amount of time spent on the repair is locating the leak.

Roy Keen Minden,NV 76 X Glenbrook

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Re: [GMCnet] does AC leak stop work? [message #175706 is a reply to message #175646]

Thu, 05 July 2012 21:13

USAussie

Messages: 15912
Registered: July 2007
Location: Sydney, Australia

Karma: 6

Senior Member

Dave,

Boy are you lucky!

I spent about 20 minutes on the phone with Larry of Deepfreeze Refrigerants
(Dura Cool) up in Ontario this morning.

We had a nice chat about the A/C system in Double Trouble and my leakage
problem.

I told him that I intended to replace every o-ring in the system and install
a copper seal on the flared fittings that were installed when the second
evaporator was installed.

He suggested rather than going through all that work to install two cans of
their System Seal sealant. He noted that it would stop any leak EXCEPT if it
was the compressor shaft seal.

I called Worthington Ag an asked them to add two cans of System Seal to my
order of a case of Dura Cool.

HOWEVER, I have decided to call Larry again and relate Paul's tale of woe to
see what he says.

Regards,
Rob M.

-----Original Message-----
From: dave silva

Products designed to stop leaks in exhaust and cooling systems are
generally a waste of time, right?

What about Air conditioning? The revocn has a slow to moderate leak- or a
whole bunch of little leaks.

I shot a bit of duracool into it- not running, it was 15psi.

A day or so later it was 5 psi.

So i figure if the leak-stop stuff works at all, then this might be a good
candidate.

Dave

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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

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