how many pounds of R134a? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-17-2007, 05:36 PM   #1
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Default how many pounds of R134a?

Now I'm doing a little work on the a/c and I don't know if I'm missing the sticker or if there is one but my question is how many pounds of r134a does a 93 bonneville take?
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Old 07-17-2007, 05:55 PM   #2
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I want to say 2.2 lbs.......

I think that'* what the sticker said on my 95......

Come to think of it, isn't a 93 still R-12?
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Old 07-17-2007, 06:49 PM   #3
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Quote:
Originally Posted by LakevilleSSEi
ICome to think of it, isn't a 93 still R-12?
Yep, the '93 used R12. I believe the transition occurred during the '94 model year.
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Old 07-17-2007, 07:13 PM   #4
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Get a retro fit kit I guess, though I'm not sure how "Retrofit" the DIY kits are....
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Old 07-17-2007, 07:18 PM   #5
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let me clarify i already changed it to r134a. im looking for how much r134a i need to put in
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Old 07-17-2007, 07:26 PM   #6
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let'* go with my first guess of about 2 lbs or so....
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Old 07-17-2007, 08:10 PM   #7
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Quote:
Originally Posted by sqela
let me clarify i already changed it to r134a. im looking for how much r134a i need to put in
This is a rough one... You really need gages to get it right...

It depends on what the system started with.. And if the system has leaked down as in empty, you'll want to have the system pumped down to remove any moisture, at the same time you'll want to see if the system will hold vacume..

If you are looking to simply retrofit the system to R134a and you have purchased the kit....

You need to make sure that the R12 has been removed and the system pumped down...

Most likely the kit will have 3 cans that will have the Refrigerant and oil...In some cases it will also have stopleak..

When charging the system you will only use 85% 134a for the charge...

Say the system used 2.4 of R12... That would be roughly 2lbs of R134a...

IIRC these cars should have been a 2.27 Lb charge of R12, so you would want 1.93 Lbs...

I will say charge the system to 2lbs, If the compressor is good, the AC should be nice and cool... Just bear in mind that R12 work better than 134a... But if Charged correctly the 134a system will cool you down..

Squirrel if you have any more questions feel free to ask Bud

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Old 07-17-2007, 11:35 PM   #8
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Don'* method is exactly what was followed in my Eighty-Eight Royale. Wal-Mart kit, AC pros said it wouldnt last 3 months. It actually lasted 3+ years and was still cooling when traded at 201k. Kept a thermometer in the vents and on a 90 mile trip, made daily, vent temps would be 36-38 degrees. So yeah, its definitely capable of cooling well. I did have the dual fans on that car, the Bonneville on 134 doesnt do as well but its tolerable. Compressor is weak on him, will only pull down to 40ish on the low side.
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Old 07-18-2007, 09:48 AM   #9
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**raises paw**

Ok next question. When I got my bonne the wiring was a bit chopped up hense the wiring for the compressor was routed on top of the motor and down the front to the compressor. Now I'm guessing that'* not how its ment to be because being that close to the exaust manifolds 'cooked' the wire a bit anyway someone with a 92-95 can get me a picture of how its spos to be wired?
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Old 07-18-2007, 09:52 AM   #10
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Look at my winter rebuild pics of the Zilla. There should be some pics there that show it pretty exposed with all the accessories off the front of the engine.
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