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R4 to Sanden whith stock ac lines(for serpantine)

Discussion in 'Heat & AC' started by yevgenievich, Jun 10, 2018.

  1. yevgenievich

    yevgenievich Full Access Member

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    Went ahead with a sanden change out on my suburban. Kept original lines by picking up a sanden unit with rear line mount and adding inline #8 discharge adapter. I will get part numbers and drawing for adapter plates posted on monday. The pulley on the compressor has extra ribs, but it does not make much difderence. Needs a longer belt, you can see in the picture I have the idler bypassed at the moment.
    tmp_18587-IMG_20180610_011359881680801.jpg
     
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  2. CorvairGeek

    CorvairGeek Full Access Member

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    That's a great conversion, there wasn't a GM compressor more poorly suited to a dual air Suburban than an R4, especially with R134a.
    I'd considered a GM V5 compressor, but the reversal of the suction and discharge ports was a problem.
    Do you have the compressor mounted inverted with the crankcase drain at the top?
     
  3. yevgenievich

    yevgenievich Full Access Member

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    It is mounted up right with oil fill on top. Slight angle to make sure valve cover is cleared.
    250cc oil fill acording to service guide
    The only non original parts are:
    # 8 High Side Inline Discharge Port R-134a 16mm
    Part #ATC6302

    Sanden 4864 (SD7H15HD-FLX)

    Longer belt k060980

    Compressor bolts that seem to work best are m10-1.5
     
    Last edited: Jun 10, 2018
  4. yevgenievich

    yevgenievich Full Access Member

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    All together. Bypassing idler seem to have work fine as well with stock belt as sanden puts less load on the belt than r4.
    tmp_11118-IMG_20180610_1118591126659858.jpg
     
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  5. yevgenievich

    yevgenievich Full Access Member

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    This 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.
     

    Attached Files:

    Last edited: Jun 11, 2018
  6. yevgenievich

    yevgenievich Full Access Member

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    Quick update. The most problematic scenario for stock ac system is mostly resolved. Parked in the middle of texas sun, start up and idle without movement. Could be a bit better still but it is now pretty decent.
     
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  7. Dtrain

    Dtrain Member

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    Just did the sanden upgrade last month, I used the longer belt, New accumulator tank, air tube, and hoses. I had to cut a small piece of metal off my throttle body air cleaner mount and shift the air cleaner about 3/4 of an inch so the snorkel would clear the suction side hoes fitting. That R 4 compressor should have never been used. The sanden works great, like a regular A/C compressor should.

    EC9C8187-DCA5-4CB3-956D-600C69B44BCE.jpeg
     
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  8. yevgenievich

    yevgenievich Full Access Member

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    I avoided the air cleaner and hoses modifications by getting sanden with matching rear ports.
     
  9. yevgenievich

    yevgenievich Full Access Member

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    Had close to ultimate test a week ago. Sitting idle in middle of Houston (100+ degrees F) for 3+ hours. Even with the 4 row aluminum radiator and hd clutch fan the temp got to 215 for coolant, but AC was able to keep up with front on medium and rear on full blast.
     
  10. rohuie

    rohuie Full Access Member

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    Did you have the AC hoses made?
     
  11. rohuie

    rohuie Full Access Member

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    Did you add the ATC6302 to have easier access to high side?
    I think I can still see the original under the air cleaner duct.

    For the Sanden, do you know what car these are used on or did you just buy using the part number above?
     
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  12. yevgenievich

    yevgenievich Full Access Member

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    Using the specific part number allows to use stock hoses. That part number specs for a big truck (18 wheelers). The atc adapter allowed for extension in order for stock lines to reach because sanden is longer
     
  13. rohuie

    rohuie Full Access Member

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    Thanks.
    Most of the Sanden's I've seen have the male ends, I was wondering where yours came from.
     
  14. Juan Torres

    Juan Torres Junior Member

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    What about the wiring my r4 has the 12 oclock two prong and a high side port in the back
     
  15. yevgenievich

    yevgenievich Full Access Member

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    Splice a new connector and set
     

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