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04-07-2021, 07:25 AM | #1 | |
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Join Date: Jul 2004
Location: JEFFERSON HILLS, Pennsylvania
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Astro a/c leak driving me nuts
2001 Astro with rear air, never had any issues until last year when compressor seal blew out. Replaced compressor, drier & orifice - evacuated/recharged and air was great last summer. This spring I flick ac on only to find out I'm completely empty on charge and found that my low pressure line going to rear ac in wheel well corroded and had a hole. Fixed that and pulled a vacuum only to see vacuum wasn't holding. I've now spent the last 2 weeks fooling with this trying to find additional leaks. I've exhausted all my means: added dye, pressurized system with shop air up to 100 psi with soap & water, used an r134 sniffer.....can't find it! If I put 100 psi in system it will hold pressure for days, but under vacuum it drains out. If I pull 30 hg and shut down, within minutes it drops to 20 hg and completely leaks out to 0 overnight.
Anybody have some clues or methods I missed? |
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04-07-2021, 03:12 PM | #2 | |
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Re: Astro a/c leak driving me nuts
Classic compressor shaft seal issue-holds pressure, not vacuum. That is the reason double lip shaft seals were introduced- although I would have thought aftermarket would have all been converted to double lips by now, maybe not.
I'd charge it. Run with it- and watch for dye stains- most likely on rear 3/8" liquid line at any grommets. I fix those with swagelok compression unions for aluminum. work great.
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Automotive A/C Engineer with: '99 IH 4700 Toy Hauler (2) '95 GEO Prizms both maroon '99 GMC Yukon '95 Chev 3500, 454 Dually Crew Cab- 145k miles- Wife's Camel trailer puller. '94 Astro- 370k miles '94 Firebird Formula- 5.7L 180k miles- gone- '92 Chevy Lumina Van 3.8L 264k '86 GMC S-15 - 2.8L 154k '87 Buick Park Ave . 187k '86 Buick Park Ave 3.8L 199k miles- gone '77 Chevy Vega- 2.5L 175k miles gone but not forgotten '68 Camaro 396 4 spd RS/SS -72k miles- |
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04-07-2021, 03:36 PM | #3 | ||
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Re: Astro a/c leak driving me nuts
Quote:
I have used the Parker A-lok (same as swagelok) double ferrules unions to fix my other van in the past with success. This time however I used the Parker CPI fittings...which are single ferrule. Even though they pass the soap test I'm wondering if I have possible vacuum leaks at those areas. |
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