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R4 to Sanden for Serpentine Systems

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Old 02-27-2015, 11:07 AM   #51
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Re: R4 to Sanden for Serpentine Systems

The TruckersAC website does have an FLX7 model (4868) that is universal with a single pulley. The price is reasonable too! That part of the equation I can figure out fairly easy. The bracket is the part I'm wondering about. The Sanden would be a great option if the original compressor dies. I don't feel the need to re-invent the wheel; if someone has already done this reliably, I'm content to pursue that avenue. I was hoping that someone who had might chime in.
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Old 03-03-2015, 11:16 PM   #52
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Re: R4 to Sanden for Serpentine Systems

Done for now... still have to connect/run wiring...
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R4 to Sanden for Serpentine Systems-img_20150302_195406.jpg   R4 to Sanden for Serpentine Systems-img_20150302_195449.jpg   R4 to Sanden for Serpentine Systems-img_20150302_195534.jpg  
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Old 03-03-2015, 11:26 PM   #53
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Re: R4 to Sanden for Serpentine Systems

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Done for now... still have to connect/run wiring...
That's really good looking Deadbird. Great job!
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Old 03-04-2015, 07:18 PM   #54
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Re: R4 to Sanden for Serpentine Systems

Very nicely done.
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Old 03-04-2015, 09:33 PM   #55
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Re: R4 to Sanden for Serpentine Systems

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Done for now... still have to connect/run wiring...
i cant tell by the pictures. is there enough room to fit tall valve covers?


looks great by the way..
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Old 03-06-2015, 07:40 PM   #56
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Re: R4 to Sanden for Serpentine Systems

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i cant tell by the pictures. is there enough room to fit tall valve covers?


looks great by the way..
Thanks guys!

Lone, I don't know how much higher tall valve covers are over stock. Mine are not stock but, I'm reasonably sure they are not tall (as compared to the old M/T covers on my 71). I wanted the compressor fairly tight in clearance to what I have...
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Old 03-19-2015, 03:22 PM   #57
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Re: R4 to Sanden for Serpentine Systems

Question, How do i wire up this compressor?

Last edited by djdsails; 03-22-2015 at 10:51 AM.
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Old 03-22-2015, 10:51 AM   #58
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Re: R4 to Sanden for Serpentine Systems

Question, How do i wire up this compressor?
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Old 03-22-2015, 11:09 AM   #59
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Re: R4 to Sanden for Serpentine Systems

Stock GM connector has a Green wire from Accumulator Low Pressure switch. Connect to wire coming out of compressor (IIRC, there is only one wire on the compressor). Other stock wire is ground, and you should not need it, but can ground it to the compressor body if there is a ground connection.
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Old 03-22-2015, 11:11 AM   #60
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Re: R4 to Sanden for Serpentine Systems

Thanks!
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Old 03-26-2015, 12:32 PM   #61
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Re: R4 to Sanden for Serpentine Systems

So since my wires from my car harness is a green wire with a resister built into it, is there anything I would need to modify on mine to get it to work?

I also have the single wire which I think is the pressure line wire. I'll get a picture up here in a bit to show you what I mean.
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Old 03-26-2015, 12:44 PM   #62
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Re: R4 to Sanden for Serpentine Systems

It's not a resistor, but a diode. Not needed on the Sanden ( it's built in I think). You may have a High Pressure switch on the back of the R4. The power runs from the Accumulator low pressure switch, thought the green wire to the R4, then out the black wire either to ground or to the High Pressure switch ( which interrupts the ground when 450PSI is exceeded). On the Sanden, you go Green to sanden. Can't remember if the Sanden has a seperate ground wire, or if it just grounds through the bolts.

You may have a third set of wires to the High Pressure switch in the High Side Pressure Line. Just leave these alone- they trigger the fan ( at least that's what I use it for).
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Old 03-27-2015, 06:04 PM   #63
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Re: R4 to Sanden for Serpentine Systems

darby is correct. the sanden is grounded to itself. you can see the blk/wht ground wire in post #52. it has a ring terminal and is screwed to the black part of the compressor.
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Old 03-29-2015, 07:37 PM   #64
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Re: R4 to Sanden for Serpentine Systems

Some of those brackets that can be used to convert the stock Harrison compressors on the right (passenger) side, over to the Sanden compressors are from Old Air, in South Fort Worth, Tx. I'm not aware of any from Vintage Air.
I haven't started mocking up my project yet, but I plan on also trying to have 1" or so spcaers made to move everything out away from the block farther for more valve cover clearance.
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Old 04-06-2015, 02:23 PM   #65
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Re: R4 to Sanden for Serpentine Systems

How much oil do I need to add to the system? The truckers Ac site gave a capacity, but do I need to add any extra?
Thanks!
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Old 04-06-2015, 03:58 PM   #66
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Re: R4 to Sanden for Serpentine Systems

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Originally Posted by djdsails View Post
How much oil do I need to add to the system? The truckers Ac site gave a capacity, but do I need to add any extra?
Thanks!
3oz in the compressor, 3 oz in the accumulator.
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Old 04-06-2015, 04:05 PM   #67
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Re: R4 to Sanden for Serpentine Systems

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3oz in the compressor, 3 oz in the accumulator.
Thanks!
So the compressor does not come with oil? And I have to add in 6oz
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Old 04-06-2015, 04:11 PM   #68
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Re: R4 to Sanden for Serpentine Systems

drain any oil in the compressor. Some ship with oil, some do not.
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Old 12-01-2015, 01:48 PM   #69
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Re: R4 to Sanden for Serpentine Systems

Great info here. how much longer is the Sander over the R4?
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Old 12-02-2015, 11:37 AM   #70
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Re: R4 to Sanden for Serpentine Systems

The Sanden is a couple of inches longer. You can Google Sanden compressors and they have a site somewhere that gives the dimensions.My R4 is mounted on the driver's side and I don't think the Sanden will fit without hitting the stock valve covers.
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Old 12-02-2015, 06:06 PM   #71
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Re: R4 to Sanden for Serpentine Systems

I have stock valve covers, no clearing problems what so ever with the Sanden compressor. The Sanden sits higher in the bracket than the R4.
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Old 12-03-2015, 02:20 AM   #72
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Re: R4 to Sanden for Serpentine Systems

If you can, please post a pic. I would really like to replace the R4. Did the Sanden mount onto the R4 bracket?
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Old 12-07-2015, 02:07 AM   #73
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Re: R4 to Sanden for Serpentine Systems

Some of the early posts mention the Vintage Air brackets that adapt the compressor to the compressor bracket. I don't have access to the car right now but if I remember correctly there is around 1 or 2 inches of clearance between the compressor and the stock valve cover. Here is one photo I took before putting the car in storage unfortunately I can't find the other pictures I took during the install. Thanks to the pioneering work of darbysan this whole conversion was very simple.

Last edited by mcquigg; 02-16-2016 at 11:38 AM.
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Old 09-01-2016, 06:49 PM   #74
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Re: R4 to Sanden for Serpentine Systems






just done this coversion on my 89 S-10 worked great. vintage air brackets worked just fine on the FLX7 compressor. stock hoses worked fine also. put in a Parallel flow condensor new dryer orifice tube. vacumed the system charged. works better than it ever has.cooling to 40 F on a 90 degree day.
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Old 04-26-2017, 09:24 AM   #75
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Re: R4 to Sanden for Serpentine Systems

Great information guys! I am currently getting the parts list together for this. Which orifice tube did you use?
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Old 04-26-2017, 10:47 AM   #76
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Re: R4 to Sanden for Serpentine Systems

I used a variable orifice tube in my system.
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Old 04-26-2017, 10:52 AM   #77
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Re: R4 to Sanden for Serpentine Systems

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I used a variable orifice tube in my system.
Do you have a part number or know the vehicle it came off of so I could find it? Thanks!
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Old 04-26-2017, 10:59 AM   #78
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Re: R4 to Sanden for Serpentine Systems

I searched for an 88 Firebird orifice tube on Autozone's website. I think they're around $20.
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Old 04-26-2017, 11:00 AM   #79
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Re: R4 to Sanden for Serpentine Systems

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I searched for an 88 Firebird orifice tube on Autozone's website. I think they're around $20.
Thanks Mcquigg!!
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Old 08-07-2017, 12:46 PM   #80
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Re: R4 to Sanden for Serpentine Systems

This thread was extremely informative...

I just did this swap. Holy crap... vents are blowing 36F air now!

I'm running a Classic Auto Air system on my 1971 Camaro, but was running a serpentine system... so I was running a R4 before and was getting 42-43F (which I thought was cold at the time). Decided to try the Sanden... glad I did.

I literally can't point the vents directly at me as it literally gets too cold now...

Any rate, thanks for posting this info!
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