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#1
06-22-2012, 04:39 PM
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What size vacuum pump should I buy for A/C work?
I am going to embark on fixing the A/C of both my W123's. After reading and searching for 3 hrs on the boards, the A/C info is disparate and scattered so I'm going to ask, which vacuum pump should I buy from Amazon:
Robinair 15115 VacuMaster 1.5 CFM Single Stage Pump, 115 microns ultimate vacuum @ $84.50 or, Robinair 15310 VacuMaster 3 CFM Single Stage Pump, 75 microns ultimate vacuum @ $105.73?
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85 300CD Signal Red/Tan sold 83 300D Manganese Brown 109K 97 E420 Midnight Blue 197K sold 98 BMW 328i Vert White 100K, sold 95 BMW 525i White 125K, sold 93 BMW 525iT Red 193K, sold 95 E320 Green Wagon 125K, sold 94 E320 White 127K, sold 85 300SD 156K Grey (Annie), sold 84 300D Lapis Blue 170K (Judy), sold 99 ML 320 Black (lease), 1998 C230 White (lease) 00 Honda S2000 Red (lease) 86 Mercedes 300E (sold) 84 Porsche 911 Red (sold), 1965 Porsche 911 White (sold) 
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#3
06-22-2012, 08:09 PM
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Either pump will be fine. The bigger one will just be able to pull down more quickly but as long as you evacuate for at least a half hour to a hour it should make no difference.
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2009 ML320 Bluetec 1985 300CD 1981 300TD  Past Mercedes 1979 300TD 1982 300TD 2000 E320 4Matic Wagon 1998 E430 1984 300SD 1980 300SD
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#4
06-22-2012, 09:06 PM
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Alterntives
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#5
06-23-2012, 01:25 AM
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Thanks, guys, going for the 1.5 cfm.
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85 300CD Signal Red/Tan sold 83 300D Manganese Brown 109K 97 E420 Midnight Blue 197K sold 98 BMW 328i Vert White 100K, sold 95 BMW 525i White 125K, sold 93 BMW 525iT Red 193K, sold 95 E320 Green Wagon 125K, sold 94 E320 White 127K, sold 85 300SD 156K Grey (Annie), sold 84 300D Lapis Blue 170K (Judy), sold 99 ML 320 Black (lease), 1998 C230 White (lease) 00 Honda S2000 Red (lease) 86 Mercedes 300E (sold) 84 Porsche 911 Red (sold), 1965 Porsche 911 White (sold) Last edited by edge; 06-23-2012 at 10:38 AM.
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#6
06-23-2012, 01:32 AM
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anybody wanna buy my old pump?
it's a 6cfm pump Ive had for 20+ years that still handles home systems down to 150 microns... (no automotive evac is getting below 1000 microns anyway...) I was out and needed a pump for a job, so now I have a 7cfm pump, and will keep it in my truck, and I don't need the old 6 anymore. $50?
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!!  1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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