73 AC

Discussion in 'E9 General Discussion' started by pickman, Apr 2, 2019.

  1. pickman

    pickman Member Site Donor

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    Thank everyone that has sent me tags and threads on this subject.

    My approach is to pull a vacuum n the evaporator tubes sticking thru the firewall - pending I get adapter fittings. If this holds I will then proceed.

    My plan is to use original R12 refrigerant and a new original OEM filter drier.

    Use the original condenser (initially)

    Per all the feedback it looks like a Sanden SD-510HD compressor New - unless there is another better choice??

    The only unknown is the compressor mounting bracket - I see an M5 is recommended I don't know the PN - unless there is another better choice?

    New hoses with fittings that fit the system.

    I will use the original fan.

    I can upgrade the condenser to parallel flow with a new fan later if required.

    R134 and R12 are similar in pressure points however have different boiling points. R134 actually extracts more heat per pound but to achieve this a larger condenser coil with more air flow is required. The TXV probably needs to be revised for 134 to achieve balance. So all in all I'll stick with R12 if possible save a few$$ and see what performance is achieved.

    Any advice on the mounting bracket PN and or compressor is much appreciated.
     
  2. aearch

    aearch Well-Known Member Site Donor

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  3. Stevehose

    Stevehose Well-Known Member Site Donor $

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    I would strongly suggest putting in the parallel flow condenser now and use with the original fan then you’ll never have to go back and change it and it’s vastly superior to the original unit. And cheap.
     
  4. pickman

    pickman Member Site Donor

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  5. pickman

    pickman Member Site Donor

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    That looks like the bracket on he 3.5 Liter Fuel injected motor I bought and converted!
     
  6. pickman

    pickman Member Site Donor

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    Sir,

    what model and make would you suggest?
     
  7. Stevehose

    Stevehose Well-Known Member Site Donor $

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  8. pickman

    pickman Member Site Donor

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    PART # 44-1618 got it thank you
     
  9. pickman

    pickman Member Site Donor

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    There was a reply some posts ago regarding AC fittings that can be purchased that adapt the high and low pressure tubes at the firewall (from the evaporator)so I can use a vacuum pump to pull vacuum.

    Any help? Please!
     
  10. pickman

    pickman Member Site Donor

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  11. pickman

    pickman Member Site Donor

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    You have done a great job! My rubber compressor bracket bushings are gone can you recommend a replacement? Also not sure on the copper washers between the evaporator to tube fittings and where to get these conical washers?
    Also do you recommend removing the water pump to effect this conversion?

    Thanks again!
     
  12. Stevehose

    Stevehose Well-Known Member Site Donor $

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    What bracket are you using? You'll need copper washers for evap. You shouldnt have to remve the water pump, once the radiator is out there's plenty of room in there. But if yu don't know how old the pump is change it. Cheap insurance.
     
  13. nyccsi

    nyccsi Member Site Donor

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  14. pickman

    pickman Member Site Donor

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    I bought the same bracket you show from Johnjoy, I have both the original York 1973 compressor bracket and a newer M30 -528 compressor mounting bracket.
     
  15. pickman

    pickman Member Site Donor

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  16. pickman

    pickman Member Site Donor

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    Please review the attched photo of the bushing I am missing - any Ideas?
     

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  17. Stevehose

    Stevehose Well-Known Member Site Donor $

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    Hmmm not offhand, perhaps remove them and measure then try a place like McMaster Carr to see if they have something. Perhaps others here have ideas.
     
  18. HB Chris

    HB Chris Well-Known Member Site Donor $$

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    That is why using the York bracket should be your last resort. I have been told you can take a poly alternator bushing and turn them down on a lathe to the right diameter. Mesa Performance offered this suggestion.
     
  19. pickman

    pickman Member Site Donor

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    Well Gentlemen I have a 528i bracket see attached - no bushings and per the forum not too much to adapt the Sanden compressor to the bracket - maybe a better way to go?
     

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  20. aearch

    aearch Well-Known Member Site Donor

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    ac1.jpg AFTER LOOKING AT MY SYSTEM I USED THE STOCK OEM M5 COMPRESSOR
    FOR THE S38B36 IT WORKS WITH THAT MOUNT WITH A TOP BRACKET
    MAKE BOTTOM AND TOP BRACKETS FROM THE EXTRA PARTS

    [​IMG]
     
    Last edited: Apr 16, 2019

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