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R4 to Sanden for Serpentine Systems

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Old 02-27-2015, 10:07 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, 10:16 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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Old 03-03-2015, 10:26 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, 06:18 PM   #54  
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Re: R4 to Sanden for Serpentine Systems

Very nicely done.
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Old 03-04-2015, 08:33 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, 06:40 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, 02:22 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 09:51 AM.
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Old 03-22-2015, 09:51 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, 10:09 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, 10:11 AM   #60  
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Re: R4 to Sanden for Serpentine Systems

Thanks!
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Old 03-26-2015, 11:32 AM   #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, 11:44 AM   #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, 05:04 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, 06:37 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, 01:23 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, 02:58 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, 03:05 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, 03:11 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, 12:48 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, 10:37 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, 05:06 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, 01:20 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, 01:07 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 10:38 AM.
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Old 09-01-2016, 05:49 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, 08:24 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, 09:47 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, 09:52 AM   #77  
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Re: R4 to Sanden for Serpentine Systems

Quote:
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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, 09:59 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, 10:00 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, 11:46 AM   #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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Old 04-03-2018, 10:30 AM   #81  
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Re: R4 to Sanden for Serpentine Systems

Can anyone tell me whether or not if my 1990 Formula already has a usable condenser? It only has 16,500 miles on it and I'm going to be converting to Sanden/R134a. Current R4 isn't bad, but it's short-cycling due to being low on R12. Not sure if I could get by with the condenser currently installed or if I should just buy a new one. Money is not the problem, but it would be nice to not have to pull the old condenser if I don't need to. True parallel flow condensers are $280 at Original Air...

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Old 04-03-2018, 10:37 AM   #82  
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Re: R4 to Sanden for Serpentine Systems

I doubt that yours has the parallel flow, as those came later. You can check by looking at your current condenser. If the ends of each row have a 180 loop into the next row, then it is not parallel flow. It will still work- it's just not as efficient.

If yours is installed in a similar fashion as mine, then it can be replaced by simply unbolting the radiator and tipping it back toward the engine. No need to remove the radiator hoses or fluid, but you might have to remove the fan. The condenser will be held in with two brackets ( 1 bolt each). Unbolt and lift up. I place a piece of cardboard between the radiator and condenser just to keep from messing up the fins.
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Old 04-03-2018, 09:26 PM   #83  
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Re: R4 to Sanden for Serpentine Systems

Thanks. I see that Original Air sells a complete conversion for 88-92 F-body cars. A bit pricey (~$850 shipped), but it includes everything except the refrigerant and the oil. Takes out some of the guess work about what works well together. Of course, piecing it together is gonna be cheaper and probably work fine, as many on here have demonstrated.
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Old 05-13-2018, 03:00 PM   #84  
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Re: R4 to Sanden for Serpentine Systems

I'm doing this on a 83 cfi car. Has anyone done that yet?
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Old 06-11-2018, 12:11 PM   #85  
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Re: R4 to Sanden for Serpentine Systems

Quote:
Originally Posted by darbysan View Post
I doubt that yours has the parallel flow, as those came later. You can check by looking at your current condenser. If the ends of each row have a 180 loop into the next row, then it is not parallel flow. It will still work- it's just not as efficient.

If yours is installed in a similar fashion as mine, then it can be replaced by simply unbolting the radiator and tipping it back toward the engine. No need to remove the radiator hoses or fluid, but you might have to remove the fan. The condenser will be held in with two brackets ( 1 bolt each). Unbolt and lift up. I place a piece of cardboard between the radiator and condenser just to keep from messing up the fins.
I purchased and have installed the Original Air Stage 3 conversion (includes everything from evaporator to condenser). I can't get it to take more than 5 or 6 oz of refrigerant. After 30" vacuum for an hour, I let it suck in all it would take (vapor only), then started and turned on the A/C on max. The compressor short-cycles (~1 second bursts) but will not suck in any more refrigerant. Low side runs about 70 psi (at 85 degree ambient) and drops briefly to 30 psi when compressor cycles. High side won't get any higher than 110 psi. What am I doing wrong?
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Old 06-11-2018, 03:26 PM   #86  
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Re: R4 to Sanden for Serpentine Systems

on some application the high side line need to have an extension. #8 inline discharge port adapter worked for my suburban.
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Old 06-11-2018, 03:27 PM   #87  
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Re: R4 to Sanden for Serpentine Systems

Quote:
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I purchased and have installed the Original Air Stage 3 conversion (includes everything from evaporator to condenser). I can't get it to take more than 5 or 6 oz of refrigerant. After 30" vacuum for an hour, I let it suck in all it would take (vapor only), then started and turned on the A/C on max. The compressor short-cycles (~1 second bursts) but will not suck in any more refrigerant. Low side runs about 70 psi (at 85 degree ambient) and drops briefly to 30 psi when compressor cycles. High side won't get any higher than 110 psi. What am I doing wrong?
Check high side pressure. Might have to short the low pressure switch to get the compressor to pull down long enough to continue charging
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Old 06-12-2018, 08:37 AM   #88  
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Re: R4 to Sanden for Serpentine Systems

This is is most up to date drawing I have for the brackets. The middle hole can be not drilled until test fitted to allow for small variations.
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Old 06-12-2018, 09:46 AM   #89  
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Re: R4 to Sanden for Serpentine Systems

I've got to get A/C back in my car.. Just wish this compressor wasn't so ugly..

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Old 06-26-2018, 05:43 PM   #90  
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Re: R4 to Sanden for Serpentine Systems

A thank you to the guys who did the leg work on this.
I used the Dirty Dingo adapter kit and it worked fine. One of the spacers was a bit short, but it works without any issue.
https://www.dirtydingo.com/shop/prod...oducts_id=1622

I got everything from Napa other than the compressor itself which I sourced online. I reused my existing low pressure switch, and high pressure switch (on the hard line below accumulator). And since my car is a 91 it already had the ~sort of~ parallel condenser. Make sure you guys remember to jumper/splice the high pressure cut out switch/connector that was on the back of the R4. I forgot and had a hour of WTF!!?? why wont cycle!!!

The only real issue I ran into was the angle of one of hoses. It was kinking pretty hard, and while I know it would have pressurized without a problem I bent the tubing a bit to relive the kink a bit. Its working great!!! and today it hit 35F from the center vent!!! After owning thirdgens for 20+ years this life changing. Even R12 never worked this well.

Random pics:




hitting AIR system, and not even all the way back.



Suction side needs to be bent so it more of a 90 degree bend.



Kinked



Bending



Finished
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