C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Anyone using the R4 Scroll Design AC Compressor?

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Old Feb 14, 2023 | 07:43 PM
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Default Anyone using the R4 Scroll Design AC Compressor?

Hi All,

My R4 compressor is leaking from the large outer shell o-rings, as they often do.
I have come across a newer version of the R4 compressor which eliminates this leak point and houses a scroll type compressor within the R4 form factor, rather than the original piston internals.
I understand it probably has less capacity than the original R4, and I can see the manufacturer is using a smaller pulley to compensate for this.
I guess it would have to be smoother running and quieter also.

Are there any early C4 guys here who have installed one?




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Old Feb 14, 2023 | 11:51 PM
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Thanks, yeah I had read that thread but there's not much more info out there. I was hoping someone had run one in a C4.
I just hit the button on Rockauto, so I'll report back once I've installed it
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Old Feb 18, 2023 | 12:45 AM
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Originally Posted by ben73
Thanks, yeah I had read that thread but there's not much more info out there. I was hoping someone had run one in a C4.
I just hit the button on Rockauto, so I'll report back once I've installed it
be brave and try it for all of us...lol..
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Old Feb 18, 2023 | 05:00 AM
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Originally Posted by iceman2003
be brave and try it for all of us...lol..
Lol, ok!
I've found a few more who seem to be happy with it so I'm quietly confident it will be a good thing.
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Old Feb 22, 2023 | 10:27 AM
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I am interested in this as well. Please post a part number from rockauto or where ever you found it.
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Old Feb 22, 2023 | 05:23 PM
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Originally Posted by Jrcflash
I am interested in this as well. Please post a part number from rockauto or where ever you found it.
There's a few different part numbers depending on you application as some have different pulleys etc. Also has different numbers if it comes pre-oiled etc.
Just go to Rockauto and find the HVAC section for your vehicle and it should be there called 'UAC Scroll Compressor"
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Old Sep 30, 2023 | 07:17 PM
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Originally Posted by iceman2003
be brave and try it for all of us...lol..
Just realized I didn't come back and update this thread!
I installed the scroll compressor back around March and it works really well. It's dead quiet, doesn't load up the motor or induce any vibrations at all like the old R4 did and it makes nice cold air.
The AC in my 'ol 84 has never been better. Nine or 10 months on, it hasn't leaked the gas out, probably a new record for my 20+ years of ownership with this car.

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Old Oct 3, 2023 | 01:14 AM
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Ben73, Thank you for the update. What was the part number that you used and is it exclusive to just the 84 car? Thank you Cheers, Jarrod
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Old Oct 3, 2023 | 01:45 AM
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Originally Posted by iceman2003
Ben73, Thank you for the update. What was the part number that you used and is it exclusive to just the 84 car? Thank you Cheers, Jarrod

I bought this one:

https://www.rockauto.com/en/moreinfo...t=6628&jsn=727

I imagine it's universal for any car with an R4 compressor.
The '84's mounting bracket actually needed a small mod as the shape of the rear of the scroll compressor was a little different to the OE type, but it was all sorted in 5mins with a file.
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Old Oct 6, 2023 | 12:10 AM
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Thank you. Glad it worked out well for you...
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