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HomeOff Topics › Auto Air Conditioning Mechanics - Need Advice
06-04-2014 04:38 AM  4 years agoPost 1
Girard Ibanez

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Tucson, Arizona (formally from Guam)

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I have an old air condition manifold gauge set (Robinair) that I used back in the early 90s for freon 22 and 12. I recently acquired a 30 lb tank of 134A and my yellow jack hose is not the correct fitting for the 30lb tank or the vehicle.

I've look at several manifold gages on ebay and notice that there is a quick disconnect fitting. The car I am attempting to recharge is a 95 Ford Windstar. I have used the 134A in the 12oz can and the hose that it came with has a quick connect.

So what I need is your thoughts on whether I should get a new manifold gage, buy the adapters, and what type of fitting is on the 30 lb tank.

I am going to calibrate my gages and see if they are accurate. Also do a functional test on the manifold valves and see if they are not leaking.

What type of pressure are the valves capable of, eg. 30 lb tank pressure?

Thanks


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06-04-2014 01:31 PM  4 years agoPost 2
BeltFedBrowning

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06-04-2014 01:57 PM  4 years agoPost 3
trekrider586

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Sylacauga,Al

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Here Ya go
You can buy the quick connect fittings for the r12 hose.Go to your local NAPA part number is 783431 and 783432.
the fitting on the tank is what we call Acme thread.the adapter you will need is part number 783199.screw it on the tank and your yellow 12 hose will work.depending on the NAPA store(company owned or franchise)that setup will run you about 101.63 plus tax.

or you can go for the part number 781400,that is on sale for 119.00
and you will have everything you need.
You can cut hoses and clamp but the red hose(high side) has positive pressure and a clamped connection in my face would worry me some.

And don't forget R134 charges as LIQUID.

it's better to ask for forgiveness than for permission

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06-04-2014 02:01 PM  4 years agoPost 4
balsabasher

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Here we go again?

Blades; what goes around, comes around!

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06-04-2014 02:06 PM  4 years agoPost 5
BeltFedBrowning

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06-04-2014 02:11 PM  4 years agoPost 6
Girard Ibanez

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Here Ya go
You can buy the quick connect fittings for the r12 hose.Go to your local NAPA part number is 783431 and 783432.
the fitting on the tank is what we call Acme thread.the adapter you will need is part number 783199.screw it on the tank and your yellow 12 hose will work.depending on the NAPA store(company owned or franchise)that setup will run you about 101.63 plus tax.

or you can go for the part number 781400,that is on sale for 119.00
and you will have everything you need.
You can cut hoses and clamp but the red hose(high side) has positive pressure and a clamped connection in my face would worry me some.

And don't forget R134 charges as LIQUID.
Are you saying that you turn the tank sideways or upside down to charge.


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06-04-2014 02:14 PM  4 years agoPost 7
Girard Ibanez

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HA HA HA. Yes, I see it now. This guy sure has A/C troubles.
BeltFedBrowning,

Not me with the AC problems. I am "Paying Forward" and helping those in need. Sometimes I fork out the bill as part of my gift. I was given a skill and for that I am grateful that I don't have to pay someone. We are all bless and this is my contribution.

The wise old man once said, if you have nothing good to say, then don't say it. Life is too young my friend, enjoy what we have and share.

Edited:

The last AC problem was not mine, but someone I once shared half of my lifetime with. Again, paying forward for the good memories we once shared.


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06-04-2014 02:14 PM  4 years agoPost 8
trekrider586

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I don't like the adapters that screw on your R-12 fittings on your car, they leak.( I mean the ones that are permanently installed.)
Yes,most Autozone,Advance and O'Reilly fittings leak.they use a depressor to push down the existing 12 Schrader core.that is no bueno.improper installation or a bad 12 Schrader core and yes they will leak.
I have had positive results with the NAPA part numbers 409901,409902 high side and 409903 low side fittings.You have to take the Schrader core out of the 12 fitting for these to work.but with two positive seals and their own Schrader core they just work.

it's better to ask for forgiveness than for permission

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06-04-2014 02:15 PM  4 years agoPost 9
trekrider586

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tank upside down.

it's better to ask for forgiveness than for permission

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06-04-2014 02:18 PM  4 years agoPost 10
Girard Ibanez

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Here we go again?
Balsabasher,

If you don't have anything good to contribute to, then may I suggest you with hold your thoughts.

I come to this forum seeking opinions of good nature. RC is my hobby and passion and there are a ton of us sharing the same passion. Why not post here seeking advice or knowledge from those who share the same passion.

I can see by your user name that you are good at what you do .... bash a thread/post.


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06-04-2014 02:24 PM  4 years agoPost 11
Girard Ibanez

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trekrider586,

I remember doing this with R22 but only for a moment and that was to speed up the refilling process.

Thanks for that tip, I will continue to educate myself in the 134A process. For now, it's about nursing my gages, hoses and fittings back to health.

I think it would be cheaper to just buy a new set. Harbor Freight, Autozone, and O'Reilly have a set but not sure of the quality. Any thoughts on these sets. I haven't checked out Napa but will do.

Found some on Ebay ... maybe I should consider Robinair products.


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06-04-2014 02:28 PM  4 years agoPost 12
BeltFedBrowning

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06-04-2014 02:49 PM  4 years agoPost 13
trekrider586

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Such as this forum....
Folks makes posts with questions or situations where there are replies by people that hopefully have had experience or knowledge with such questions or situations,ensuring a POSITIVE outcome for the OP.I believe there is a button for all the others...

Good for the OP taking time and resources to help someone else in need.
As far as the gauges go.. Robinair is the better ones,But they are pricey as well.If you are getting into 134 and want a dedicated set by all means...
But the numbers I gave you will enable you to utilize your existing Robinair Manifold and hoses to do 134.plus you will have the ability to go back to 12.
As a NAPA owner,support your local parts store and stay away from the others if you can.
134a runs a higher head pressure than 12.So don't be surprised what took 36 oz of 12 to fill would take a lot less 134.

it's better to ask for forgiveness than for permission

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06-04-2014 04:50 PM  4 years agoPost 14
Girard Ibanez

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Girard, was not poking fun or being offensive. I don't know the history between you and balsa. I took balsa's post as meaning that you have more than your fair share of A/C troubles.
BeltFedBrowning,

Thanks for the clarification. No history between me and Balsa.


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06-04-2014 04:56 PM  4 years agoPost 15
Girard Ibanez

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trekrider586,

Thanks for the tips and advice. I sure appreciate it.

Last 4 weekends in a row I have been working on cars. Changing struts, shocks, oil, fluids and it's not even my own. Lots of time put in, and $$$ and now my tired legs/knees are feeling the aches of the old age syndrome. It's nice to Pay Forward.


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06-04-2014 10:05 PM  4 years agoPost 16
Girard Ibanez

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Anyway to correlate the temperature settings on this particular gage for the 134A? Or should I just use a chart similar to this http://acprocold.com/faq/r-134a-system-pressure-chart/


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06-05-2014 02:33 AM  4 years agoPost 17
jbiter

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Sebring, FL

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I thought putting liquid on the suction side of the compressor was a bad idea....

Jeff

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06-07-2014 02:44 PM  4 years agoPost 18
trekrider586

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jbiter,
not the case in automotive A/C systems.as a matter of fact it would be impossible to charge it thru the pressure side.that's why the quick disconnect fittings are different sizes,to prevent that.
the freon can would explode with deadly results on the high side.

in the old 12 systems you had to charge as gas.134 you can charge as gas,but it is recommended to charge as liquid.
I'm sure as you already know,it's the change from liquid to gas that actually does the cooling.

it's better to ask for forgiveness than for permission

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06-21-2014 05:17 AM  4 years agoPost 19
Girard Ibanez

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I am not sure why you would charge 134A in liquid vs gas. What I do know is that if you charge liquid you can damage the compressor valves.

Perhaps one would think that we charge 134A liquid is because on a HVAC recovery machine, the 30lb bottle is installed upside down. That is probably designed to move the 134A in liquid form into another holding container internal to the HVAC recovery machine.


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06-21-2014 06:59 AM  4 years agoPost 20
nitro fun

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Oc ca

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All the new refrigerants are blends, you have to charge by liquid or you will get seperation...
You control how fast you charge by the manafold guages valves, how much you crack it open.

Trying to charge a 60 ton ac unit by gas, you would be thier all day.

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