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09-05-2021, 08:28 PM | #1 |
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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 | #2 |
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Location: Temple City
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Re: R12 Vacuum
Yes it is just not as fast.
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09-06-2021, 08:23 AM | #3 |
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Join Date: Oct 2010
Location: Ocean Springs, MS
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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 |
09-06-2021, 12:27 PM | #4 |
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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 |
09-06-2021, 01:04 PM | #5 |
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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 |
09-06-2021, 02:32 PM | #6 | |
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Location: Orlando Florida
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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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09-06-2021, 06:03 PM | #7 |
Just here to tinker
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Location: Holland, MI
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Re: R12 Vacuum
Yep. Yellow one goes to the vacuum pump. Are you using a micron gauge to tell how far down you are pulling the system?
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09-06-2021, 06:26 PM | #8 |
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Re: R12 Vacuum
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09-06-2021, 06:15 PM | #9 |
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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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