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Author Topic: 1994 r-134a ?  (Read 13435 times)

Offline Irish_Alley

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1994 r-134a ?
« on: May 21, 2010, 04:40:12 pm »
OK I have a 94 standard wheel base (swb)  truck with a 4.3 need to know how much freon and what type of pag oil to put into a new system.
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Offline VileZambonie

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Re: 1994 r-134a ?
« Reply #1 on: May 21, 2010, 05:06:56 pm »
R-134a PAG (Polyalkaline Glycol) synthetic refrigerant oil (GM Part No. 12345923) or equivalent.

2lbs of R134A

Your orifice tube will be in the liquid line After the condenser
 
 



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Offline Irish_Alley

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Re: 1994 r-134a ?
« Reply #2 on: May 21, 2010, 07:14:22 pm »
Are we talking about 46 100 or 150 pag?
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Offline VileZambonie

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Re: 1994 r-134a ?
« Reply #3 on: May 21, 2010, 09:10:31 pm »
It's PAG 150 but you can use alternatives
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Offline Irish_Alley

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Re: 1994 r-134a ?
« Reply #4 on: May 24, 2010, 12:55:47 pm »
Well not sure what to after putting in the pag oil and guessing about 28oz of freon the compressor will kick on then it will shut off it keeps doing this I'm thinking like it doesn't have enough pressure to keep. Running so it shuts down then the pressure builds up and it kicks back on idk. But the pressure gauge is reading real high even shortly after I added the first bottle
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Offline VileZambonie

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Re: 1994 r-134a ?
« Reply #5 on: May 24, 2010, 01:11:55 pm »
Well you are 4 oz short still and it is a CCOT system. Cycling clutch orifice tube. Do you have a manifold gauge set?
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Offline Irish_Alley

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Re: 1994 r-134a ?
« Reply #6 on: May 24, 2010, 02:09:50 pm »
Manifold gauge? I got the recharge kit from autozone that has a. Gauge with it.  What's the ccot do?
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Offline VileZambonie

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Re: 1994 r-134a ?
« Reply #7 on: May 24, 2010, 04:38:01 pm »
That little gauge won't tell you squat. A manifold gauge set is used to check pressures, recharge, evacuate etc. To prevent the evaporator from icing the low pressure switch cuts the current to the compressor coil to making it cycle on and off. The orifice tube drops the pressure making it drop it's temp. Make sure the pipe the orifice tube is in is insulated also or it will absorb engine compartment heat.  Add your other 4 oz and see how it performs.
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Offline eventhorizon66

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Re: 1994 r-134a ?
« Reply #8 on: May 24, 2010, 04:58:09 pm »
Vile:  Can you recommend an good inexpensive manifold gauge set (134a, but I guess I'll need R12 adaptor fittings)?
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Offline VileZambonie

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Re: 1994 r-134a ?
« Reply #9 on: May 24, 2010, 09:58:41 pm »
http://www.harborfreight.com/a-c-manifold-gauge-set-92649.html

the fittings you can get at the autoparts store
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Offline eventhorizon66

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Re: 1994 r-134a ?
« Reply #10 on: May 24, 2010, 10:35:10 pm »
Thanks, I knew about that one, but didn't know if it was junk or not.  The only other alternatives are $80+ sets.
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Offline Irish_Alley

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Re: 1994 r-134a ?
« Reply #11 on: May 25, 2010, 04:19:12 am »
let me make sure this is right. I'll be going to my dads today to use his gauge and if he don't have it we will go to our old shop and use that stuff but the high pressure line from the compressor to the condenser is hot almost as if it was the temp of a heater core line not to hot to touch but uncomfortable and the low side from the evap core to the condenser is cooler not yet frosting over but cold to the touch same from the accumulator to the compressor does all this sound right?
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Offline VileZambonie

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Re: 1994 r-134a ?
« Reply #12 on: May 25, 2010, 10:57:43 am »
the evaporator is the coldest part of the system and the top of the condeser is the hottest part of the system
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Offline Irish_Alley

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Re: 1994 r-134a ?
« Reply #13 on: May 25, 2010, 07:20:43 pm »
Think I found out the problem what about the air in the system does it have to be pumped out or something?
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When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline VileZambonie

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Re: 1994 r-134a ?
« Reply #14 on: May 25, 2010, 08:19:14 pm »
Yes you need to vacuum the system
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