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#1
06-29-2012, 07:40 PM
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1990 Park Avenue A/C Low Pressure Service Port
Is the port I circled in red the low pressure service port for charging the AC on my 1990 Park Avenue?
I bought a r134a retrofit kit, and the low-pressure adapter fits onto this port. I found another port on one of the hoses, but the low-pressure adapterwouldn't fit (the high-pressure one did) but it was hard to reach, so maybe I was not lining it up, correctly? Are the high-pressure and low-pressure service ports in an r12 system different sizes? I have no idea what I'm doing, here. I just don't want to hook up the can to the high-pressure port and explode the can. While the AC is running, the tube indicated with a blue arrow is frosty, if that helps at all. Actually, here's a video while it's running (with the r134a retrofit adapters installed where I think they should be) https://www.dropbox.com/s/knu8xmmhso...629_173822.mp4 So... is that the low-pressure service port on the silver canister? 
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#2
06-29-2012, 08:53 PM
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Re: 1990 Park Avenue A/C Low Pressure Service Port
yes
__________________
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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aseyCay (06-29-2012)
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#3
06-30-2012, 08:34 AM
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Re: 1990 Park Avenue A/C Low Pressure Service Port
In some cases, the compressor has to be replaced for a retrofit, but I don't think this is the case with your vehicle.....
Did you recover the R-12 and remove most of the mineral oil ? Did you add Pag oil? Did you pull a vacuum? Vehicle this old you should have replaced the accumulator, too......did you add the proper amount of R-134a?
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