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05-12-2009, 08:19 AM
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#1 |
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Registered User
 
Join Date: Jun 2004
Location: On The Beach, S C
Posts: 613
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Sub dual a/c problem
My 72 sub dual a/c system won't hold freon. Leaks out in 2 -4 weeks. Used dye. No leaks found. Anyone had a similiar problem? Is there a "likely" place to look? This things got me frustrated!
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4oldcars Driving: 1971 Jimmy w/68 Chev front clip, 1953 Bel Air 2 dr hdtp, 1996 Roadmaster wagon, 2000 Eldorado The ones I let go: 1931 2 dr sedan, 1935 pick up, 1938 2 dr sedan, 1962 SS 454, 1963 409 wagon, 1970 short bed, 1972 short bed, 1972 sub, 1976 short bed, 1986 long bed, 03 short bed |
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05-12-2009, 07:42 PM
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#2 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Sub dual a/c problem
did you check all along the hoses going to the back? Rubber hoses run under thet ruck and then up through the paneling on the passenger side
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05-13-2009, 12:33 AM
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#3 |
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Registered User
Join Date: Dec 2005
Location: White Rock Canada
Posts: 865
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Re: Sub dual a/c problem
I found a leak in one of the hoses running underneath, the "holding" clamp weakened and had rubbed against the drivshaft. I probably would of noticed the sound except my stereo's too loud
 Al.
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1972 GMC Sierra 1972 GMC Super Custom Suburban |
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05-13-2009, 08:15 AM
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#4 |
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Registered User
Join Date: Jun 2004
Location: On The Beach, S C
Posts: 613
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Re: Sub dual a/c problem
Thanx for the info, but I've checked the lines as much as is accessible. Thanx to some one else's problem that I read about, I am familiar with the routing of the lines. I don't look forward to having to replace those lines.
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4oldcars Driving: 1971 Jimmy w/68 Chev front clip, 1953 Bel Air 2 dr hdtp, 1996 Roadmaster wagon, 2000 Eldorado The ones I let go: 1931 2 dr sedan, 1935 pick up, 1938 2 dr sedan, 1962 SS 454, 1963 409 wagon, 1970 short bed, 1972 short bed, 1972 sub, 1976 short bed, 1986 long bed, 03 short bed |
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05-18-2009, 11:53 AM
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#5 |
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Mike
Join Date: Jan 2003
Location: west chester pa
Posts: 2,474
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Re: Sub dual a/c problem
I replaced my lines a couple years ago. It is not very hard.Remove the door panel and side panel,and you will have no problem.
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70'c/10, 71 suburban4x4 402bb, 72suburban 4/6 drop, 72k/5 4x4 blazer 4" lift 35 tires |
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05-18-2009, 12:22 PM
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#6 |
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Pickin' and a Grinin'
Join Date: May 2006
Location: Arizona
Posts: 128
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Re: Sub dual a/c problem
Who makes the lines runnin to the back?
Id like to replace mine!! |
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05-18-2009, 12:50 PM
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#7 |
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Mike
Join Date: Jan 2003
Location: west chester pa
Posts: 2,474
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Re: Sub dual a/c problem
I bought mine online from ackits.com. You buy it in bulk. I reused the factory hose ends and clamps. I also used Nylog O-Ring Lubrication to coat the fittings and orings. It helps to seal them. I have not had any problems with leakage.
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70'c/10, 71 suburban4x4 402bb, 72suburban 4/6 drop, 72k/5 4x4 blazer 4" lift 35 tires Last edited by smokekiki; 05-18-2009 at 12:54 PM. |
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05-18-2009, 07:56 PM
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#8 |
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Junior Member
Join Date: Mar 2005
Location: Albuquerque, NM
Posts: 275
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Re: Sub dual a/c problem
If you cant's find a leak with the dye it may be one of the evaporator cores leaking inside the a/c boxes. best to access the boxes and make sue it is not an evaporator. The dye will find it's way out with the freon.
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