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#1
07-04-2015, 06:42 PM
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Vacuum pump for A\C work
I'm assembling some tools to do some A\C work and am wondering if the pump I have is good enough.
Its a GAST Vacuum Pump DOA-V720-AA I got it for free so its no big deal if its no good. I just wanted to know before I got fittings for it if it would do the job or not.
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2004 F150 4.6L -My Daily 2007 Volvo XC70 -Wife's Daily 1998 Ford F150 -Rear ended 1989 J-spec 420SEL -passed onto its new keeper 1982 BMW 733i -fixed and traded for the 420SEL 2003 Volvo V70 5 Speed -scrapped 1997 E290 Turbo Diesel Wagon -traded for above 1992 BMW 525i -traded in 1990 Silver 300TE -hated the M103 1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one 1979 Silver 300D "The Silver Slug" -Sold 
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#2
07-04-2015, 07:55 PM
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Do you have your licence? Even if you are working only with 134 it is still a good idea. Are you only working on your own car or are you getting into this to work on others. If you are going to work only on your car that pump might do the job but if you are going to do much of it you might want to get something that works a little faster. Look at how much air volume the pump moves to get an idea how fast it will pull a vacuum. If you want your licence/ certification for automotive HVAC go to this site http://www.epatest.com/ and then go to the 609 section.
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1983 300SD 200000miles
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#3
07-04-2015, 08:07 PM
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Yes the pump is good enough.
Quote:
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CENSORED due to not family friendly words 
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#4
07-04-2015, 09:16 PM
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Quote:
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1983 300SD 200000miles
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#5
07-04-2015, 11:23 PM
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Thanks, it will only be for my car, so time is not a huge deal.
__________________
2004 F150 4.6L -My Daily 2007 Volvo XC70 -Wife's Daily 1998 Ford F150 -Rear ended 1989 J-spec 420SEL -passed onto its new keeper 1982 BMW 733i -fixed and traded for the 420SEL 2003 Volvo V70 5 Speed -scrapped 1997 E290 Turbo Diesel Wagon -traded for above 1992 BMW 525i -traded in 1990 Silver 300TE -hated the M103 1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one 1979 Silver 300D "The Silver Slug" -Sold
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#6
07-05-2015, 10:25 AM
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I was looking over the site, and that pump is more for scientific work...
Ac work needs deep moisture removing vacuum... I'm trying to find the micron rating for the pump... But, in Canada, the only refrigerant you can buy for cars is the enviro safe propane stuff...and vacuum isn't a necessity with it... So... Sure, use that pump.
__________________
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 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#7
07-05-2015, 10:28 AM
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It would work GREAT for testing door locks, and such though...
__________________
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 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#8
07-05-2015, 01:01 PM
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Sorry, but the GAST pump only pulls about 25.5, ac work needs 29.9"hg or better. The purpose of pulling a vacuum is to change the boiling point of water to 70F so that the moisture in the system boils off while you are pulling the vacuum. Of course this assumes that your working environment ambient temp is above 70F. of course you can help the process by warming the various ac components with a heat gun or hair dryer. Good luck!
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#9
07-05-2015, 11:11 PM
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Quote:
Quote:
__________________
2004 F150 4.6L -My Daily 2007 Volvo XC70 -Wife's Daily 1998 Ford F150 -Rear ended 1989 J-spec 420SEL -passed onto its new keeper 1982 BMW 733i -fixed and traded for the 420SEL 2003 Volvo V70 5 Speed -scrapped 1997 E290 Turbo Diesel Wagon -traded for above 1992 BMW 525i -traded in 1990 Silver 300TE -hated the M103 1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one 1979 Silver 300D "The Silver Slug" -Sold
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#10
07-06-2015, 10:34 AM
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Quote:
Keep in mind, the blown out enviro safe is flammable, and you need to be careful of sparks...
__________________
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 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#11
07-06-2015, 10:38 AM
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Interesting....
__________________
2004 F150 4.6L -My Daily 2007 Volvo XC70 -Wife's Daily 1998 Ford F150 -Rear ended 1989 J-spec 420SEL -passed onto its new keeper 1982 BMW 733i -fixed and traded for the 420SEL 2003 Volvo V70 5 Speed -scrapped 1997 E290 Turbo Diesel Wagon -traded for above 1992 BMW 525i -traded in 1990 Silver 300TE -hated the M103 1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one 1979 Silver 300D "The Silver Slug" -Sold
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#12
07-06-2015, 10:47 AM
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So would pulling a vacuum on the system be completely pointless then or would it still be best practice?
__________________
2004 F150 4.6L -My Daily 2007 Volvo XC70 -Wife's Daily 1998 Ford F150 -Rear ended 1989 J-spec 420SEL -passed onto its new keeper 1982 BMW 733i -fixed and traded for the 420SEL 2003 Volvo V70 5 Speed -scrapped 1997 E290 Turbo Diesel Wagon -traded for above 1992 BMW 525i -traded in 1990 Silver 300TE -hated the M103 1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one 1979 Silver 300D "The Silver Slug" -Sold
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#13
07-06-2015, 11:01 AM
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With that pump, it wouldn't accomplish much.
__________________
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 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#14
07-06-2015, 11:17 AM
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I meant if I were to buy a proper A\C pump
__________________
2004 F150 4.6L -My Daily 2007 Volvo XC70 -Wife's Daily 1998 Ford F150 -Rear ended 1989 J-spec 420SEL -passed onto its new keeper 1982 BMW 733i -fixed and traded for the 420SEL 2003 Volvo V70 5 Speed -scrapped 1997 E290 Turbo Diesel Wagon -traded for above 1992 BMW 525i -traded in 1990 Silver 300TE -hated the M103 1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one 1979 Silver 300D "The Silver Slug" -Sold
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#15
07-06-2015, 02:20 PM
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I'm of the mind that proper vacuum is important no matter what refrigerant you use, because the oil getting moisture in it, becomes acidic...
but the folks at envirosafe don't feel it's necessary.
__________________
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 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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