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Replacing R4 with v5 or v7 compressor

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Replacing R4 with v5 or v7 compressor

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Old 06-06-2004, 10:55 PM
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Replacing R4 with v5 or v7 compressor

Has anyone done this or even thought of this other than me.

If I am not the first I would like to see pic's and details on the modification.

I am most interested in how to make the bracket to mount the compressor without tearing up belts or interfering with the valvetrain.
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Old 04-12-2011, 10:53 PM
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Re: Replacing R4 with v5 or v7 compressor

I found a youtube video where a guy adapted a Harrison V5 compressor to an old Nova. He had a 305 in it with the f-body serpentine brackets. I messaged him about how he did this and he said he just looked for a V5 compressor that the mounting ears were close to the R4 mounting holes and made his own brackets to fit. The variable displacement segment of the compressor is all built in. So if you can get it mounted and the pulley lined up and get +12v to the clutch, you're good to go. I will be doing this to my 'bird this summer.

http://www.youtube.com/watch?v=P5hkk...el_video_title

Last edited by sjgrimsley; 04-12-2011 at 10:55 PM. Reason: Forgot link
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Old 11-13-2014, 05:29 PM
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Re: Replacing R4 with v5 or v7 compressor

Hello my Friend, I've just installed an OLD V5 compressor from a '93 cavalier to my '92 suburban, and Works great! Even with the r12 control valve, measure 42 - 43 F at the vents 90-95 outside temp, pretty much difference tan R4 Noisy machine. I will post later some pics to show you can adapt the V5 compressor, probably the 70% less drag on idle and you just put a little gas when light turns on Green and you can feel immediatly the confort. 2-4 minutes to cool down whole inside suburban cabin. (Dual evaporators)
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Old 11-15-2014, 01:46 PM
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Re: Replacing R4 with v5 or v7 compressor

If you're going to a V5 compressor, I'd recommend getting a NEW unit. It might be wise to go with a new unit regardless of compressor type. I've gone through three V5 rebuilds (DIY store brands and NAPA) that didn't last more than two years before getting noisy.

Noise = black death soon follows

Last edited by paulo57509; 11-15-2014 at 01:50 PM.
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Old 11-17-2014, 11:17 AM
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Re: Replacing R4 with v5 or v7 compressor

Originally Posted by Chuy85 View Post
Hello my Friend, I've just installed an OLD V5 compressor from a '93 cavalier to my '92 suburban, and Works great! Even with the r12 control valve, measure 42 - 43 F at the vents 90-95 outside temp, pretty much difference tan R4 Noisy machine. I will post later some pics to show you can adapt the V5 compressor, probably the 70% less drag on idle and you just put a little gas when light turns on Green and you can feel immediatly the confort. 2-4 minutes to cool down whole inside suburban cabin. (Dual evaporators)
V5 does not have enough displacement to run Dual Evaporators for long term without cooking itself to death. I would recomeend a Vortec serpentine setup and aftermarket Valeo/Sanyo/Sanden style Vortec HT6 replacement. Have one on my Express van and it will FREEZE you out of the van on a 105*F day. I am also using a Duramax mechanical fan and a heavy duty fan clutch.
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Old 11-21-2014, 08:46 AM
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Re: Replacing R4 with v5 or v7 compressor

Originally Posted by Fast355 View Post
V5 does not have enough displacement to run Dual Evaporators for long term without cooking itself to death. I would recomeend a Vortec serpentine setup and aftermarket Valeo/Sanyo/Sanden style Vortec HT6 replacement. Have one on my Express van and it will FREEZE you out of the van on a 105*F day. I am also using a Duramax mechanical fan and a heavy duty fan clutch.
Will the vortech accessories bolt up to our cars?
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Old 11-21-2014, 09:11 AM
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Re: Replacing R4 with v5 or v7 compressor

Originally Posted by Ozz1967 View Post
Will the vortech accessories bolt up to our cars?
That is a negative, but my response was to a guy with a 92 suburban attempting to run the V5 in place of his R4.
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Old 11-21-2014, 09:14 AM
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Re: Replacing R4 with v5 or v7 compressor

The accessory setup is tall and narrow and will not clear a TPI and might even hit the hood.

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Old 11-21-2014, 09:30 AM
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Re: Replacing R4 with v5 or v7 compressor

I'm running a carb, CC Qjet, so I have some room in the front that TPI doesn't (for ducting), but the hood clearnace is still an issue. How much taller than our stock set up is it?
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Old 11-21-2014, 09:35 AM
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Re: Replacing R4 with v5 or v7 compressor

Originally Posted by Ozz1967 View Post
I'm running a carb, CC Qjet, so I have some room in the front that TPI doesn't (for ducting), but the hood clearnace is still an issue. How much taller than our stock set up is it?
The compressor and alternator mount over the valve cover. Overall height including the a/c manifold hose is proably 7" over the valve cover. I could get a measurement from my brothers Tahoe if you want.
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Old 11-21-2014, 09:39 AM
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Re: Replacing R4 with v5 or v7 compressor

Originally Posted by Fast355 View Post
The compressor and alternator mount over the valve cover. Overall height including the a/c manifold hose is proably 7" over the valve cover. I could get a measurement from my brothers Tahoe if you want.
If you want, but that doesn't even sound like it will pass an eyeball test for fitment. I'm going to measure how tall mine is over the valve cover tonight when I get home from work. Of course having it "fit" is different than getting it installed and "fitted". Lots of hose massaging to get it to work.
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