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Hurst 
Orange Level
Joined: 11 Sep 2009
Location: Midway, Ky
Points: 1213
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 Topic: 7000 A/C leaks
Posted: 03 May 2010 at 1:30pm |
I got a call from my Dad this PM and he called to tell me that the A/C in my 7000 black belly was not very cold when he used it for the first time this summer. I went though the entire system 2 years ago and replaced all the o rings, hoses, and the expansion valve. I had a bad hose in the system. It holds a charge through the summer pretty well as far as I can tell (I never added any last summer), but every winter it loses the charge. It has the original A6 compressor on it. I have run both 134a and the hydrocarbon refrigerants in the system, and both leak out about the same. Is this just normal for an older A6 compressor, or should I be looking for a leak in the 134 adaptor fittings on the compressor? I have had these in mind as being the culprits for a while, but I haven't changed them. I have done soap and water over the connections and found no bubbling. Maybe someone on here has had a similar experience?
Hurst
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1979 Allis Chalmers 7000
5800 Hours
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ryan(IN)
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Joined: 11 Sep 2009
Location: Bluffton,IN
Points: 766
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Posted: 03 May 2010 at 1:48pm |
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we've just came to the conclusion that they're almost always going to leak out during the winter.
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ryan
1984 8070 FWA,1979 7060,1975 7040,1971 190,1960 D-17D,1957 D-14, 196? D-19G, 1975 5040,1971? 160,1994 R62
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Skyhighballoon(MO)
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Joined: 11 Sep 2009
Location: Pilot Grove, MO
Points: 3115
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Posted: 03 May 2010 at 5:05pm |
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Might be the same thief stealing Eldon's air out of the tires...sure gets around going from WA to KY, LOL! Mike
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1981 Gleaner F2 Corn Plus w 13' flex
1968 Gleaner EIII w 10' & 330
1969 180 gas
1965 D17 S-IV gas
1963 D17 S-III gas
1956 WD45 gas NF PS
1956 All-Crop 66 Big Bin
303 wire baler, 716H, 712H mowers
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Joe(TX)
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Joined: 11 Sep 2009
Location: Weatherford. TX
Points: 1682
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Posted: 03 May 2010 at 5:20pm |
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Did you install barrier hoses or standard R12 hoses? The standard hoses will leak with R-134a.
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Onslowe in Mo
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Joined: 09 Jan 2010
Location: Montrose, Mo.
Points: 35
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Posted: 03 May 2010 at 5:23pm |
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The A6 compressor isn't inherently leak prone. Some systems just have a weak spot or two that is hard to find, even with a halogen leak detector. On a hard to find leak, I think using UV dye in the system and then checking for leaks is the only way to find it.
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CTuckerNWIL
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Joined: 11 Sep 2009
Location: NW Illinois
Points: 22823
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Posted: 03 May 2010 at 6:30pm |
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My brother had a slow leak in his Caravan and the mechanic said it would cost $700 to fix because there was a leak up under the dash and in the back. He went to Wallyworld and bought some refrigerant with a sealer included and puts one can in every year about this time. Much cheaper and easier than gutting the inside of the vehicle and paying out the nose for the repair.
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Brian Jasper co. Ia
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Joined: 11 Sep 2009
Location: Prairie City Ia
Points: 10508
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Posted: 03 May 2010 at 6:47pm |
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The A-6 is one of the easiest compressors to replace a shaft seal in if thats where it's leaking. Tracer dye is what you need. Dye will find the leaks too small for a halogen detector to find. Just need a black light and amber colored glasses. Ford and GM both started putting dye in the systems from the factory about 2002. That's a God send for warranty or otherwise A/C work.
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"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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Hurst
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Joined: 11 Sep 2009
Location: Midway, Ky
Points: 1213
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Posted: 03 May 2010 at 7:29pm |
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There is some oil residue I remember last time I was home right above the compressor pulley, but it seemed to be pretty well crusted over with dead bug guts. I read that A6's were pretty bad about having a little oil leak out of the shaft seal with the noninterface ceramic seals they used. I guess I need to try the UV dye first before throwing parts at the compressor/AC system. The replacement hoses were barrier hoses rated for 134.
Hurst
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1979 Allis Chalmers 7000
5800 Hours
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