Stop leak for A/C systems - Vintage Mustang Forums

 
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post #1 of 8 (permalink) Old 05-17-2017, 01:56 PM Thread Starter
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Stop leak for A/C systems

I know I'll get the rants on expecting better living through chemistry, but this is for an old Jeep that's not worth an evaporator change. It's a 2002 Grand Cherokee that will be hitting it's 300K birthday this year, and has had a slow leak in the evaporator since last year. It's not worth the effort to do an evap job so I'm looking for an external solution.

Blue Devil has a product they call (strangely) Red Angel that is supposedly oil based and will not react with any moisture in the system. According to their propaganda spiel, this lack of interaction with moisture will prevent "crystals" from forming inside the system as opposed to other older sealants that will react to moisture and cause compressor damage...

So, does anyone know of an effective sealant? I figure used car lots must know what kind of additives work best but I don't know anyone in that business any more.

John

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post #2 of 8 (permalink) Old 05-17-2017, 02:03 PM
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I've probably had the best luck fixing broken A/C systems using Two55....
Honestly tho- having previously been in the stealership ring, more often then not they just topped them off, added a little extra oil, and kicked them down the road. Generally speaking by the time the cold quit being cold, the terd was passed the warranty period- problem solved..

Buckle up- I wanna try something!!
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post #3 of 8 (permalink) Old 05-17-2017, 08:13 PM
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Stop leak if it works is only temporary. It can also stop up things you don't want to..... A/C repair is not that hard if you take it slow and get input from someone who has done it before....Just got my A/C working in my 67 this weekend.. It was 94 here yesterday Replaced condensor (stopped up completely - maybe stop leak ??) and of course the dryer. Have a recovery machine but just used Harbor Freight vacumn pump....Topped off with oil & R-12 and it's 34* coming out the vents... again JMHO

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post #4 of 8 (permalink) Old 05-17-2017, 09:28 PM
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First question is how long will your system hold a vacuum ? Red Angel works well if you have a slow leak .

68 302-4V w/1.84",1.54" ported , Comp XE268H , 2200 rpm Hughes converter, 3.25 9" w/10x2.5" shoes , MSD box/distrib , RPM intake , 670 Holley , cross flow aluminum radiator , Granada discs......


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post #5 of 8 (permalink) Old 05-17-2017, 09:56 PM
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I have a Jeep Wrangler, mine just turned 350,000 miles. Aside from the evaporator coil and 2 compressors and one filter/dryer, my leaks were small, about a can a month.


The easiest way to fix your leak is have an AC man use his Freon sniffer, usually an 'O' ring, sometimes the filter/dryer will pinhole, replace the parts, then go to your chain parts house and borrow their vacuum pump to evacuate the system, then add the necessary Freon.
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post #6 of 8 (permalink) Old 05-18-2017, 10:33 AM Thread Starter
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It leaks out about a pound every two or three weeks. My buddy has a sniffer and we found freon in the distilled water puddle that collects under the car. No other fittings or hoses leaking. An evaporator change in a Grand Cherokee is a nasty job. Pull the dash, steering column, air bags..

If I can fix this or slow it down enough to just add a can every few months, I'll call it win.

John

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http://i689.photobucket.com/albums/v...mustangftp.jpg
now sandblasted and DP40'd since this pic was taken.
http://i689.photobucket.com/albums/v...ngdriveway.jpg
a two legged hole shot, even with a munged up carb and snow tires...
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post #7 of 8 (permalink) Old 05-18-2017, 06:45 PM
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Quote:
Originally Posted by John_Del View Post
I know I'll get the rants on expecting better living through chemistry, but this is for an old Jeep that's not worth an evaporator change. It's a 2002 Grand Cherokee that will be hitting it's 300K birthday this year, and has had a slow leak in the evaporator since last year. It's not worth the effort to do an evap job so I'm looking for an external solution.

Blue Devil has a product they call (strangely) Red Angel that is supposedly oil based and will not react with any moisture in the system. According to their propaganda spiel, this lack of interaction with moisture will prevent "crystals" from forming inside the system as opposed to other older sealants that will react to moisture and cause compressor damage...

So, does anyone know of an effective sealant? I figure used car lots must know what kind of additives work best but I don't know anyone in that business any more.

John
With any type of stop leak "you pays your money and you takes your chances." The effectiveness of the stop leak is more about the nature of the leak than the effectiveness of the miracle cure. I have been there with 15-20 year old vehicles. Sometimes you get lucky, most times you don't.

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post #8 of 8 (permalink) Old 05-19-2017, 10:57 AM
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wow a can a month, my 93 GT uses a can every 4 years and i thought that was bad lol

good thing i stock piled some R12, I still have 6 cans left

1970 Mach 1 San Jose built Dec 23 1969. Marti says 1 of 7. Purchased in 1987. Original family owner of the powertrain 351C 2v FMX.


1993 GT 11,000 miles, Built 2-12-93 Auto, 3:27 Axle, cloth, sunroof. Untouched except for rubber and battery, Purchased new 8-3-93. still has the factory windshield fluid and new car smell.
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