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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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    Viktor
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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
     
  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
     
  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.
     

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