Oriface tube location

[lanconcj]

The Texas summer has won! I am finaly fixing my ac. The original Harrison 610 worked but leaked badly. I bought a delco compressor, drier, and an oriface tube. I have stripped out the old stuff thinking I would learn the location of the oriface tube. Either the previous owner took it out, or I just cant find it. Cany anyone describe or post a picture of where I need to put the new one?

[gchemist]

It's located on the lower hose fitting of the evaporator.
Look at this picture.


The orfice tube is in the hose fitting under the blue cap.

I hope you are upgrading the condensor. For R134 it's a huge difference. I also wrapped my accumulator with tar wrap paper. In 100 degree days, the A/C can cool down to 60 degrees.

[DetroitIron]

Based on my ac system rebuild and research, consider a variable orifice tube vs the stock fixed variety. My ac blows 42 degrees from the center vent even at idle or stop and go driving. It was about $30 vs $5 for the fixed, but I believe it has enhanced the performance of my complete R134 conversion..not to mention it supposedly helps keep compressor head pressure from getting too high. Good luck
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[lanconcj]

Thanks, I found it and replaced it.

[lanconcj]

I have cold air! Thanks again for the help.

[misternash2]

tell me more about the variable orifice tube. do you have a part number? i've got an 88 suburban and i'm wanting to fix up the ac on it. also, where are you guys getting "upgraded condensers"? mine has the original, i'm sure it's more fins per inch and coil size to maximize efficiency, but i'm not familiar with where to source one. are you just using an 88-98 chevy condenser or something?

[lanconcj]

On my 86 single cab, i changed the compressor, accumulator, O rings, and oriface tube. Following a link from this sight, I went to auto parts right now, and bought the brand new delco r4. The accumulator and orafice tube cam from there also and both parts were what the web sight recomended. Free shipping (3 days delivery) and $218.00 later I was putting it together. I have read many threads on this sight about converting to 134. I appreciate the knowledge and have laughed at the arguments. With the above new parts and a charge of the system, I am cooler than ever. The heat index in my area has been 106 all week but I am cool (not just because I drive a square).

[gchemist]

R134 condensor for our trucks: Part Number: 636420 Ready-Aire - Air Conditioning Condenser for 81-87 trucks



Unless you get a very old stock number parts, all new condensors should be cross flow type. You can see the differences. R12 condensors have single tubes that wrap back and both. R134 condensors have mutiple rows from the ends that flow across.

Best $119 spent on fixing my A/C issues.