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Need help on vacuum/recharge.
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jmh51193
Novice
Aug 19, 2009, 2:07 PM
Post #1 of 10
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Need help on vacuum/recharge.
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My high and low ports both leaked so it would not hold refrigerant. I have got all my tools together but still need a little help. I have gauges, vacuum pump, rerigerant and compressor oil. Here is my plan.
1. Replace high and low port. Anything that needs to be done special to sell the new schneider valve in the low port and high port.
2. Attach low and high port hoses from gauges.
3. Start vacuum and open high and low valves on gauge.
4. Run for 30 minutes and let sit for 30 to check for leaks.
5. Close gauge valves and unscrew hose to vacuum and attatch to compressor oil.
6. Open low port valve and let the vacuum suck the oil in.
7. close ports.
8. Start truck and turn ac on wide open.
9. Open valves and refill refrigerant.
Problem. I do not have access to the type of refrigerant containers
that shops use so there is no point to puncture the can of refrigerant
at the end of the hose. Any ideas on how to do this. I though about
just unhooking the low port and attatched a gauge that does but that
will loose the vacuum. I would appreciate any help. I need to get this
working by the weekend.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Aug 19, 2009, 9:32 PM
Post #3 of 10
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Re: Need help on vacuum/recharge.
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Takes some equipment no matter how you slice it. Side taps, scales, and YOU can get a tap that will run 12oz pure 134a thru gauges directly - Quest to name one brand.
Second thread of this section discusses "Charging Procedures" as best I have found out there so far. Worth a print - note links are disabled last I checked but the info is there,
T
This is the quest set below - NFG except for hoses as manifold doesn't read vacuum!
Quest / 24 in. long do it yourself manifold gauge and hose set  PREVIOUS | NEXT   
Price: $54.99
AVAILABILITY: SEND TO STORE LIST AVAILABLE Normally stocked at your local store. SHIP TO HOME AVAILABLE Ships within 2 business days.
Can run this using gauge set thru yellow hose or on it's own..........
(This post was edited by Tom Greenleaf on Aug 19, 2009, 9:41 PM)
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jmh51193
Novice
Aug 20, 2009, 10:40 AM
Post #4 of 10
(2936 views)
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Re: Need help on vacuum/recharge.
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I vacuumed it for 30 minutes and it created no vacuum on the gauge? Whats going on.
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 20, 2009, 10:45 AM
Post #5 of 10
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Re: Need help on vacuum/recharge.
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You have a massive leak somewhere if your sure the pumps was working.
Did you remember to open the valve on the gauges?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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jmh51193
Novice
Aug 20, 2009, 10:50 AM
Post #6 of 10
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Re: Need help on vacuum/recharge.
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Yeah I opened the valves. I dont think I have a leak other that my ports because before I just recharged it and that lasted about a week so it cant be but so big of a leak. Could the gauges be bad.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Aug 20, 2009, 11:03 AM
Post #7 of 10
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Re: Need help on vacuum/recharge.
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Does your gauge read VACUUM? Some don't! At sea level 29.92 +/- a tad is a full vacuum. If your gauges read a
zero AND have an area for vacuum you have a leak to fix. Atmosphere is about 17psi and vacuum is measured in either microns or inches of mercury - AKA Hgs. IMO if you can hold over 29 you are good to go. Adjust that about 1 Hg per 1,000 ft of elevation if involved. That exactly meaning if you live 3,000 ft above sea level then 26.92 would be correct,
T
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jmh51193
Novice
Aug 20, 2009, 11:14 AM
Post #8 of 10
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Re: Need help on vacuum/recharge.
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Could it be the way I replaced the ports? Do you have to use thread tape on the high port or anything. The high port just screwed of and the low was a valve inside. I replaced both but maybe I did it wrong. Possible?
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Sidom
Veteran
/ Moderator
Aug 20, 2009, 2:13 PM
Post #9 of 10
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Re: Need help on vacuum/recharge.
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Sounds like you're using a good gauge set so I'll assume the same. Take a look at the end of your charge hose, most have a schrader valve in them that maybe your pump isn't depressing, you may have to remove it. If that is good, with the hoses disconnected, close the high side valve, open the low side valve on the manifold and close the valve on the service end and see if you can pull a vacuum on the gauges that way, if you can then as HT mentioned, you problem have a very big leak somewhere.
I would probably pull a vacuum for an hour, you really only need about 5 minutes to see if the system will hold a vacuum.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Aug 21, 2009, 3:00 AM
Post #10 of 10
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Re: Need help on vacuum/recharge.
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If still reading ZERO only which is atmospheric pressure not a vacuum then test out the gauges with plug in even just low side line. In reality you could pull a total vacuum thru either high or low side but gauges I know of show the Hgs on low gauge.
There are several ports that will leak some but not while hooked up or proper cap on them.
From ZERO with pump going and line hooked up even to just low side you would see a negative # in a few seconds with decent pump.
Some service ports and Acme gauges don't cooperate. You need to know your own equipment as they do vary some in how they operate. Some have check valves (don't own any yet) built into hose ends. Kind of like air chucks.
Again - Acme ports can leak and unlike tire valves the cap is the final line of defence. Ball style more apt IMO that Shrader style tend to leak. Hooked up as said it shouldn't leak down the vacuum if all is well,
T
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