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need advice on new 134 system re charge

jt4 on Wed October 15, 2008 3:46 PM User is offline

Year: 1996
Make: jeep
Model: cherokee
Engine Size: 4.0
Refrigerant Type: r-134
Ambient Temp: 70
Pressure Low: 22
Pressure High: 225
Country of Origin: United States

I installed a completely new system in my 96 cherokee originally a 134 system still a 134 system.. I added specified oil 75% to comp 25%to drier. Drew down vacuum for 30 min with pump on then tested with pump off for 45 min no loss of vacuum. Followed all guidelines specified in the evac and recharge posting on this forum. total of two 12oz cans into system. FSM states 32 oz is system capacity? A friend told me that a 12oz can is equal to 1 lb(16oz)?? So I only put in 2 cans. I have alot of foam /bubbles in site glass still

ambient temp 70'F
middle dash vent after 5 min comp engaged =44'F chart states 38-46'F normal
low side=22 range in chart is 18-30
high side=225 range is 150-220

So is my friend right about bottle weight?
Should I put 8oz more into system?
Bubbles ever go away at that ambient or w/134a?

Thanx

GM Tech on Wed October 15, 2008 3:49 PM User is offline

12 ounces is 3/4 of a pound. 16 ounces = 1 lb tell your friend to study up some more

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

jt4 on Wed October 15, 2008 4:00 PM User is offline

Thats what I thought. He went into some theory on expansion of a compressed liquid. Anyways looks like I could add some more? High side isn't to high?
Thanks

HECAT on Wed October 15, 2008 5:42 PM User is offline

Its not liquid, it is a gas (smoke), and when it expands in the lungs, it confuses the brain.

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TRB on Wed October 15, 2008 5:47 PM User is offlineView users profile

Quote
Originally posted by: HECAT
Its not liquid, it is a gas (smoke), and when it expands in the lungs, it confuses the brain.


Hecat there are a few liquids that will confuse the brain also.


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HECAT on Wed October 15, 2008 6:02 PM User is offline

Sorry, I just could not resist.

Yes, there are liquids that confuse the brain also.

Phase change aside (gassing), a liquid cannot be compressed. Hydraulic principles 101.

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HECAT: www.hecatinc.com You support the Forum when you consider www.ackits.com for your a/c parts.

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jt4 on Wed October 15, 2008 7:18 PM User is offline

thanx for the help
I added 8oz as per my scale
Still have bubbles in site glass.

engine at 2000rpm
ambient = 92'f
center vent after 5 min w/comp engaged 44'f
lp=28
hp=340-360

it works good enough for me, the hp side scares me, FSM says 315 for hp?

Does it look ok to you guys?

Edited: Wed October 15, 2008 at 7:20 PM by jt4

Chick on Wed October 15, 2008 7:19 PM User is offlineView users profile

Check under the hood for a sticker stating the system amount and put that much in..Don't run your system until it's full, as the oil travels with the refrigerant, and a low system won't properly move the oil.. As stated, an ounce is an ounce, 16 of them make a pound, doesn't matter if it's milk or oil... Always go by the underhood sticker, may be on the underside of the hood, FSM second..(there have been cases of underhood stickers being wrong, but I've never seen it on a jeep..)

Also check fan operation, should be running full speed at those temps, (if an electric fan is installed with the engine fan) clean the condenser and make sure the area between the condenser and radiator are clean..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Edited: Wed October 15, 2008 at 7:21 PM by Chick

jt4 on Wed October 15, 2008 7:24 PM User is offline

I checked the sticker under the hood it says 2lb also. Cond and radiator are new. and elec fan on only one speed. Do the numbers look good?

Thanks


Edited: Wed October 15, 2008 at 7:26 PM by jt4

chris142 on Wed October 15, 2008 9:14 PM User is offline

Quote
Originally posted by: jt4


Still have bubbles in site glass.



Ignore the glass. It has no use in a R134a system. I paint em so that do it yourselfers wont come back to me complaining about seeing bubbles in it. It's supposed to have bubbles.

iceman2555 on Wed October 15, 2008 10:47 PM User is offlineView users profile

I like liquids that confuse the brain....never did the 'gas' thing....but sure did enjoy the liquid part.....but in the old age...this has changed to a good ole cold Coke....diet....no caffine.....and the brain is still confused.....must be all the freon sniffin over the years...opps...there goes the 'gas' thing.....

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TRB on Wed October 15, 2008 11:40 PM User is offlineView users profile

Quote
Originally posted by: chris142

Ignore the glass. It has no use in a R134a system. I paint em so that do it yourselfers wont come back to me complaining about seeing bubbles in it. It's supposed to have bubbles.

LOL



-------------------------
When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

jt4 on Thu October 16, 2008 12:51 AM User is offline

So I am assuming that my pressures and temp drop are all good, since no one has told me otherwise. Thanks for the help, I will pass on the humor to my "wise" friend! lol

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