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Additional questions prior to charging the AC 900 1994

posted by  rstarkie on  Tue Jul 16 04:39 CST 2019
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last visit: Fri Oct 24 10:14 CST 2014
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I am continuing to work toward finally getting the air conditioning working again on this car. I had a previous post here:
https://www.brickboard.com/RWD/volvo/1666198/940/960/980/V90/S90/ac_recharge_condenser_replacement.html

I am confused about which receiver/dryer port I pour the PAG oil into. Does it go into the port on the condenser side (large pipe entering the front) or the evaporator pipe out the side?

https://imgur.com/a/7STtab6


As an aside I did replace the orifice tube today. To the best of my knowledge the system is original other than a compressor discharge hose ten years ago and the recently replaced condenser. I don't know if the amount of crud on the orifice tube is normal or not. It doesn't seem like a lot for 25 years of service.


https://imgur.com/a/yYzLm7n

Any twenty minute job is just a broken bolt away from a three day ordeal








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    Follow up after peoples' help 900 1994

    posted by  rstarkie on  Fri Aug 9 13:33 CST 2019
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    last visit: Fri Oct 24 10:14 CST 2014
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    I am tardy in posting this follow up.

    I swapped out the receiver dryer and the orifice tube, then added the PAG 100 oil.

    Both AutoZone and O'Reilly's offer "free rental' on the vacuum pump and gauge set.

    I added what I determined to be 33 ozs. of 134a. It was only 80 degrees out when I did this but the discharge air was 43 degrees. Being a dark car and temps into the 90's it could be better but on longer drives I am happy with the results.

    I found these YouTube videos to be helpful:

    https://www.youtube.com/watch?v=BXTZURC5iQ0
    https://www.youtube.com/watch?v=Pdq8JAlct6s

    --
    Any twenty minute job is just a broken bolt away from a three day ordeal








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    Additional questions prior to charging the AC 900 1994

    posted by  Amarin on  Tue Jul 16 16:27 CST 2019
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    last visit: Thu Oct 23 22:42 CST 2014
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    Hi rstarkie,



    Q1: I am confused about which receiver/dryer port I pour the PAG oil into. Does it go into the port on the condenser side (large pipe entering the front) or the evaporator pipe out the side?

    A: Use the side port on the receiver/drier (arrowed). Not that big front pipe in the photo.




    Q2: As an aside I did replace the orifice tube today. To the best of my knowledge the system is original other than a compressor discharge hose ten years ago and the recently replaced condenser. I don't know if the amount of crud on the orifice tube is normal or not. It doesn't seem like a lot for 25 years of service.

    A: Those are moderate wear particles (tiny aluminium bits) on the tube's mesh. The tube in photo also shows blackened mesh which is caused by finer wear particles (fine as graphite powder) all of which came from compressor. A better looking tube would show just few wear particles without blackened mesh. For 25 years of service I think this acceptable. Important thing is the tube is dry and there is no sludge on it.


    I don't think a flush is warranted in this case. As you'll be replacing components and adding more fresh oil those remaining wear particles (the fine graphite type) will be diluted out causing minimal wear.

    Amarin.








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      Additional questions prior to charging the AC 900 1994

      posted by  rstarkie on  Tue Jul 16 18:43 CST 2019
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      last visit: Fri Oct 24 10:14 CST 2014
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      Thanks, Amarin! Not only for the needed information but also for putting the photos up from the imgur site I used. I could not get them to display with the HTML that was supposed to work.

      Randy
      --
      Any twenty minute job is just a broken bolt away from a three day ordeal








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    Additional questions prior to charging the AC 900 1994

    uid 6573's pic
    posted by  javalion on  Tue Jul 16 11:56 CST 2019
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    last visit: Wed Jul 23 09:57 CST 2014
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    I can not remember. I replaced the oil from the port(s) that the oil poured out of. Replaced it with the same amount plus a little extra.

    The orifice tube of wife's 1995, 150K, looked cleaner than the one in your photo. Of course I replaced it. Son put it in backwards and I had to pull it out to correct it

    Tom







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