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04-29-2013, 07:17 PM
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#1 |
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Registered User
Join Date: Aug 2009
Location: hillborough nc
Posts: 410
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a/c questions
Hey guys I am finally getting my 79 k10 on the road and I am wanting to get the a/c working again I was wondering how much Freon it is supposed to hold? I know it’s about 20% less that r12 it was originally on how many ounces of r134 would that be? , also what all is needed for the compressor to run? Is it more than just power and ground any other tips are greatly appreciated
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77 chevy BIG 10 350/sm465/12bolt w 3.73 bout 240 horse power NO power steerin 79 chevy 1/2 ton 250/three on the tree/3.08s soon to get built 250/floor shift conversion/3.08s 81 mercedes 300d 25 MPG 77 chevy BIG DOOLEY 454/sm-465/14 bolt 4.10s "fully loaded" 73 plymouth duster 225 slant six/230 3 speed/8 1/4 trying to acheve 300 horse six http://www.cardomain.com/ride/3135091 '77 chevy trucks. built to stay tough. life is short build a hot rod 
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04-29-2013, 08:51 PM
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#2 |
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BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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Re: a/c questions
You need to a jump wire in the low pressure switch. The low pressure switch powers the high pressure and compressor switches. The switches run in series. If any trip, power is cut off to the compressor. Is the system stock? Is the compressor on the driver or passenger side? Ounces should be based on pressure. I'll have to look for a link that gives ~pressures based on ambient temperature. You can follow this square body conversion write up.
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04-29-2013, 10:48 PM
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#3 |
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Registered User
Join Date: Aug 2009
Location: hillborough nc
Posts: 410
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Re: a/c questions
its factory a/c with the huge axiel compresser mounted on the drivers side. thanks for that artical man thats gonna help alot, i looked under the hood of my 77 dulley and it has been converted to r134 and it says on the sticker it holds 3.25 pounds of freon does that sound about right?
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77 chevy BIG 10 350/sm465/12bolt w 3.73 bout 240 horse power NO power steerin 79 chevy 1/2 ton 250/three on the tree/3.08s soon to get built 250/floor shift conversion/3.08s 81 mercedes 300d 25 MPG 77 chevy BIG DOOLEY 454/sm-465/14 bolt 4.10s "fully loaded" 73 plymouth duster 225 slant six/230 3 speed/8 1/4 trying to acheve 300 horse six http://www.cardomain.com/ride/3135091 '77 chevy trucks. built to stay tough. life is short build a hot rod
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04-30-2013, 08:00 AM
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#4 |
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BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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Re: a/c questions
3.25 lbs sounds like a lot to me. I think it's somewhere between 2-3 lbs. You live in a cooler climate so 2-3 should be about right. Mine has ~2.5 or so with a serpentine belt conversion. Compressor is on the passenger side. Are you using a stock condensor? Or are you upgrading to a correct crossflow R134 type?
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