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09-05-2021, 08:28 PM
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#1 |
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Registered User
Join Date: Apr 2017
Location: Fort Worth
Posts: 111
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R12 Vacuum
Started to pull vacuum on my OEM R12 system and noticed the valve on the high side is a smaller diameter than the low side valve. As a result my R12 dual gage can’t fit on the high side valve. Can I just pull vacuum using the low side only? Thank you
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09-05-2021, 08:37 PM
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#2 |
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Registered User
Join Date: Dec 2012
Location: Temple City
Posts: 3,628
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Re: R12 Vacuum
Yes it is just not as fast.
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09-06-2021, 08:23 AM
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#3 |
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Registered User
Join Date: Oct 2010
Location: Ocean Springs, MS
Posts: 1,746
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Re: R12 Vacuum
You'll need a high-side adapter to use both gauges. They are still available.
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Gary 1971 Chevrolet C/10 1951 GMC 100 1977 GMC C15 1955 Chevrolet 3100 |
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09-06-2021, 12:27 PM
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#4 |
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Registered User
Join Date: Apr 2017
Location: Fort Worth
Posts: 111
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Re: R12 Vacuum
While the threads on my yellow jacket R12 gauge fit on the low side- the schraeder valve on the low side isn’t being depressed by the valve on gauge set. Katrina- is this the adapter you are speaking of. Kinda frustrated as I bough the yellow jacket gauge set labeled R12 as I figured it would hook right up? Thank you
Last edited by 44SAA; 09-06-2021 at 12:47 PM. Reason: Photo |
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09-06-2021, 01:04 PM
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#5 |
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Registered User
Join Date: Oct 2010
Location: Ocean Springs, MS
Posts: 1,746
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Re: R12 Vacuum
The high side adapter looks like this: https://www.ebay.com/itm/153812368295
You attach it to the evaporator inlet then screw on your yellow jacket hose. If you get no pressure reading on the gauge, there is something wrong with the valve or hose. Or, no refrigerant.
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Gary 1971 Chevrolet C/10 1951 GMC 100 1977 GMC C15 1955 Chevrolet 3100 |
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09-06-2021, 02:32 PM
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#6 | |
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Registered User
Join Date: Jun 2014
Location: Orlando Florida
Posts: 1,598
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Re: R12 Vacuum
The blue line hooks there. Looks like you have the yellow in your hand.
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Quote:
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09-06-2021, 06:03 PM
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#7 | |
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Just here to tinker
 
Join Date: Jun 2008
Location: Holland, MI
Posts: 3,697
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Re: R12 Vacuum
Quote:
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78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/showthread.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 73 Chevy C20(Daily)http://67-72chevytrucks.com/vboard/s...d.php?t=852767 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(sold) |
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09-06-2021, 06:15 PM
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#8 |
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Registered User
Join Date: Apr 2017
Location: Fort Worth
Posts: 111
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Re: R12 Vacuum
Thank you. I realize the yellow hooks up to the vacuum pump and the blue to low side. I just posted that pic to show the fitting that will not engage the schraeder valve as it is identical to the blue hose fitting. Thank y’all for the help. It’s been frustrating.
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09-06-2021, 06:26 PM
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#9 | |
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Registered User
Join Date: Apr 2017
Location: Fort Worth
Posts: 111
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Re: R12 Vacuum
Quote:
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Linear Mode
