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Thread: R409 for R12

  1. #1
    Join Date
    Oct 2003
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    65
    has anyone ever used r409 to replace r12 in a motorvehicle?was talkin to a friend and he said 409 was a good replacement never tried it though.

  2. #2
    Join Date
    Aug 2003
    Location
    Baltimore area
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    1,818
    I would not recommend it in a car. It runs alot higher head pressure than R-12 does and on those hot days you will know it !! I have always used R-414b(Hot Shot) on cars and never had a problem.

  3. #3
    Join Date
    Oct 2003
    Posts
    65
    thx , for the reply, do you know if its a direct drop in or do you need to change/ add oil just lookin for knowledge on the subject never heard of the 409 on cars.

  4. #4
    Join Date
    May 2004
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    11,858

  5. #5
    Join Date
    Aug 2003
    Location
    Baltimore area
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    1,818
    Originally posted by lusker
    409 will work with AB, Mineral and POE

    414 is not recommended with POE but AB and Mineral is good.
    You say 414b is not compatable with POE oil ? It is a drop in replacement for R134a also so it would have to be compatable , right ????

  6. #6
    Join Date
    Oct 2003
    Posts
    65
    just found out R409 is not approved in motorvehicles,thx for your help

  7. #7
    Join Date
    May 2004
    Posts
    11,858
    414 is not recommended for POE. I didn't say it wouldn't work.

    The problem is that 414 is 50% R-22 and runs high head pressures and you can't have a lot of heat with POE. I run 414 in my son's car. It works just fine but I think you can't use 409 in automtive.

  8. #8
    Join Date
    Jul 2001
    Location
    Gold Coast of Connecticut
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    4,545
    I have used mp-66 many times.

  9. #9
    Join Date
    Jun 2004
    Posts
    420
    409 works, but it's better suited for med temp refrigeration and runs really high head pressure in a car. It's also not SNAP approved for use in cars.

  10. #10
    Join Date
    Mar 2003
    Location
    Cincinnati
    Posts
    7,977
    I've put 409a in 2 of my cars over 5 years ago and they're still going. I didn't see the headpressure problem. I know a few other guys that have used it too. But that being said it isn't aprovved for mvac. If I was doing it for somebody else I would do it right and retrofit it.

  11. #11
    Join Date
    Jun 2004
    Posts
    420
    I've ran it in one of my cars also. Head pressure is not really a problem, but it is definately higher than R12. Not really any higher than a 134a retrofit would run though.

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