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Re: [GMCnet] A/C vacuum pump [message #326230 is a reply to message #326211]

Tue, 21 November 2017 19:18

USAussie

Messages: 15912
Registered: July 2007
Location: Sydney, Australia

Karma:

Senior Member

Tyler,

Air powered vacuum pump = Vacuum level: 28.3 in. of mercury at sea level

See this chart: https://www.quora.com/What-happens-to-boiling-point-of-water-in-vacuum

Electric vacuum pump = One stage pump draws vacuum down to 75 micron

The air powered pump will not drop the pressure low enough to boil water that is in the system.

Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808

-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Tyler
Sent: Tuesday, November 21, 2017 11:35 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] A/C vacuum pump

If you are really on a budget I have used

https://www.harborfreight.com/air-vacuum-pump-with-r134a-and-r12-connectors-96677.html

the 18$ (and maybe a coupon cheaper) version with satisfactory results on several systems. As good? nope. 70% as good for 15% price?
yep. And certainly good enough to know if system is leaking. A big air compressor helps a lot. I used to use it on a 10 gallon
one...let it charge the air tank, discharge the vacuum pump, shut off vacuum, and recharge air. almost like bleeding brakes old
style. 80 gallon air now, let er rip

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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

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[Message index]

		[GMCnet] A/C vacuum pump By: Kingsley Coach on Mon, 20 November 2017 20:31
		Re: [GMCnet] A/C vacuum pump By: Ken Henderson on Mon, 20 November 2017 21:50
		Re: [GMCnet] A/C vacuum pump By: midlf on Tue, 21 November 2017 01:37
		Re: [GMCnet] A/C vacuum pump By: USAussie on Tue, 21 November 2017 05:48
		Re: [GMCnet] A/C vacuum pump By: Keith V on Tue, 21 November 2017 09:02
		Re: [GMCnet] A/C vacuum pump By: Ken Henderson on Tue, 21 November 2017 09:43
		Re: [GMCnet] A/C vacuum pump By: Keith V on Tue, 21 November 2017 10:38
		Re: [GMCnet] A/C vacuum pump By: James Hupy on Tue, 21 November 2017 10:50
		Re: [GMCnet] A/C vacuum pump By: James Hupy on Tue, 21 November 2017 11:04
		Re: [GMCnet] A/C vacuum pump By: Keith V on Tue, 21 November 2017 11:07
		Re: [GMCnet] A/C vacuum pump By: emerystora on Tue, 21 November 2017 11:26
		Re: [GMCnet] A/C vacuum pump By: Richard Denney on Tue, 21 November 2017 15:04
		Re: [GMCnet] A/C vacuum pump By: Kingsley Coach on Tue, 21 November 2017 18:01
		Re: [GMCnet] A/C vacuum pump By: Ken Burton on Tue, 21 November 2017 01:48
		Re: [GMCnet] A/C vacuum pump By: Larry on Tue, 21 November 2017 10:16
		Re: [GMCnet] A/C vacuum pump By: Kingsley Coach on Tue, 21 November 2017 11:00
		Re: [GMCnet] A/C vacuum pump By: roy1 on Tue, 21 November 2017 10:48
		Re: [GMCnet] A/C vacuum pump By: Tilerpep on Tue, 21 November 2017 11:35
		Re: [GMCnet] A/C vacuum pump By: Kingsley Coach on Tue, 21 November 2017 13:22
		Re: [GMCnet] A/C vacuum pump By: Dave Stragand on Tue, 21 November 2017 14:36
		Re: [GMCnet] A/C vacuum pump By: tphipps on Tue, 21 November 2017 14:59
		Re: [GMCnet] A/C vacuum pump By: Matt Colie on Tue, 21 November 2017 18:09
		Re: [GMCnet] A/C vacuum pump By: USAussie on Tue, 21 November 2017 19:18
		Re: [GMCnet] A/C vacuum pump By: Richard Denney on Tue, 21 November 2017 23:24
		Re: [GMCnet] A/C vacuum pump By: USAussie on Wed, 22 November 2017 07:14
		Re: [GMCnet] A/C vacuum pump By: k2gkk on Wed, 22 November 2017 07:23
		Re: [GMCnet] A/C vacuum pump By: USAussie on Wed, 22 November 2017 07:29
		Re: [GMCnet] A/C vacuum pump By: jhbridges on Wed, 22 November 2017 10:24

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