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Unread 06-04-2013, 07:38 PM   #1
RaevynCarrion
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AC Help

So, I put a hole in my A/C condenser last summer, and with temperatures already hitting 90+ this year, I need to replace it so I can keep the little one cool in the summer. I bought a new condenser, but was told I'd have to "Evacuate" the system, and can't really use the A/C Pro store-bought can stuff to refill it.

Any tips/how-tos/general directions?

Much appreciated.


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Unread 06-04-2013, 08:01 PM   #2
deermjd
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You will need a refrigerant manifold guage. It will have low and high pressure gauges and fittings as well as a yellow hose for a can tap. You will also need a refrigerant vacuum pump that will attach to the guage set. The vacuum pump is used to pull a complete vacuum on the AC system to remove moisture and noncondensable gases. Unless you already have these items or have access to them you are much better off it to take it to a shop to evacuate and recharge your system.
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Unread 06-04-2013, 08:03 PM   #3
deermjd
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But you can replace the condenser yourself assuming the system has no refrigerant charge.
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Unread 06-05-2013, 01:41 PM   #4
zj97ltd
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A lot of places will also say if you're opening up your system, replace the receiver/dryer while you're at it.
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Unread 06-05-2013, 01:53 PM   #5
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Originally Posted by zj97ltd View Post
A lot of places will also say if you're opening up your system, replace the receiver/dryer while you're at it.
Yes, especially if you live in a humid climate. The receiver/dryer has a dessicant in it that removes moisture from the conditioned air to prevent mold build up and evaporator freeze up. Since your system has been open (hole in the condenser) for quite some time now, it is safe to say that your receiver/dryer probably won't function correctly if you re-use it.

Rock Auto has the receiver/dryer with hoses for right around $40 IIRC.
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Unread 06-05-2013, 03:39 PM   #6
RaevynCarrion
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How much should it cost to get the system evacuated?
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Unread 06-05-2013, 03:54 PM   #7
coralman
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Probaly an hour of shop labor maybe 30. 60 up depending on the shop. Strongly suggest replacing the reciever drier. A long vacumn will be needed to wrest the moisture out of thr dessicant in the drier if possible. If you have any vo-tech schools in your area the students will do it for a fee probaly cheaper than any other way.
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Unread 06-05-2013, 03:55 PM   #8
a70eliminator
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Yes, especially if you live in a humid climate. The receiver/dryer has a dessicant in it that removes moisture from the conditioned air to prevent mold build up and evaporator freeze up. Since your system has been open (hole in the condenser) for quite some time now, it is safe to say that your receiver/dryer probably won't function correctly if you re-use it.

Rock Auto has the receiver/dryer with hoses for right around $40 IIRC.
Your partially right as it does have a dessicant surrounded by a filter although it's purpose has nothing to do with conditioned air, it is part of the refrigeration cycle.
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Unread 06-05-2013, 04:09 PM   #9
RaevynCarrion
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Originally Posted by a70eliminator View Post
Your partially right as it does have a dessicant surrounded by a filter although it's purpose has nothing to do with conditioned air, it is part of the refrigeration cycle.
So, is it necessary that I replace this? I'm partially repairing the A/C for the value of the truck, but mostly because I need it for the baby.
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Unread 06-05-2013, 04:27 PM   #10
a70eliminator
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It's my opinion that yes you absolutely should replace the reciever dryer, I have 4 years of HVAC school universal certified and have 20yrs of in the field of HVACR, standard practice is new dryer especially on refrigeration.
However, I repaired the condenser on my own jeep that got punctured and did not replace the dryer, I also replaced the orings in my wifes AC hoses and did not replace the dryer either, just purged them down to about 200 microns which took overnight to dehydrate, thats the beauty of owning a vac, pump and micron meter.
If I were a plumber I would be up to my neck in water too.
My AC's all work efficiently despite my backyard practices but would never recommend to anybody to not install new dryers.
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Unread 06-05-2013, 04:30 PM   #11
RaevynCarrion
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So if it worked okay for you, that makes me a little less weary about not having the cash for the dryer. Do you think pulling one from the scrap yard would be safe?
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Unread 06-05-2013, 04:40 PM   #12
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You'll probably be fine as long as your compressor didn't blow, It takes only 1 tiny molecule of moisture in a system to freeze and block the orifice of the suction line, tiny fragments of metal from a blown rod or wiped bearing in the compressor will get there too, there's just so many variables. Are you planning to take it to a speedy re-charge place? Without a vacuum pump your wasting money on cans of r134 from wally world.
A junkyard reciever is definately no, a new is about 40bux and comes with the assosiated o-rings and hoses, not bad.
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Unread 06-05-2013, 04:53 PM   #13
RaevynCarrion
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Rock Auto actually has one for 30ish, so there's that. I don't know of any places, but I'm looking into it. I still haven't swapped the condenser, and the compressor was actually just put in last year and worked fine when I had it recharged then.
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Unread 06-05-2013, 05:51 PM   #14
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The pain will be getting the the hose connection loose from the evap connection at the firewall which requires an inexpensive tool available at parts houses. Sometimes the installation of the connection goes smoothly and sometimes it doesn't. The tugging involved starts another leak in the evaporator or the new hose doesn't mate properly. AC is a pain sometimes and often not cheap. BIG LOTS, a florida chain, currently sells 134A for $9 a pound. Eliminator is giving you good advice. On a side note, how did you come up with a nic that equates to crow road kill?
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Unread 06-05-2013, 06:05 PM   #15
RaevynCarrion
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Originally Posted by coralman View Post
The pain will be getting the the hose connection loose from the evap connection at the firewall which requires an inexpensive tool available at parts houses. Sometimes the installation of the connection goes smoothly and sometimes it doesn't. The tugging involved starts another leak in the evaporator or the new hose doesn't mate properly. AC is a pain sometimes and often not cheap. BIG LOTS, a florida chain, currently sells 134A for $9 a pound. Eliminator is giving you good advice. On a side note, how did you come up with a nic that equates to crow road kill?
Nic? Crow road kill?
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