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Thread: working on the dash a/c (drivers air)

  1. #1
    Join Date
    Sep 2018
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    Fulltimers
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    25

    Default working on the dash a/c (drivers air)

    Anyone know what the charge is on the a/c on an old xl? This is a 1985 with r12. York compressor running off the camshaft pully.
    Compressor says 10 oz oil charge and I am guessing about 4 oz for the rest of the system.
    I am also guessing 4 to 5 lbs of r12 but if anyone happens to know for sure it would help.
    Only the one evaporator in the dash.

  2. #2
    Join Date
    May 2012
    Location
    Beverly Hills
    Posts
    4,652

    Default

    If the service manual is not available on line, I'd call Prevost PASS. I believe the newer dash only systems are charged to about 7 pounds.


    Gil and Durlene
    2003 H-3 Hoffman Conversion

  3. #3
    Join Date
    Nov 2018
    Location
    PIEDMONT
    Posts
    462

    Default

    Thread derail - Sandz I remember when you guys initially posted pics of this bus. Your interior/woodwork is the most beautiful of any coach I've seen yet. Ever.

    Billy & Lisa Gaines
    1996 Marathon XL40

  4. #4
    Join Date
    Sep 2018
    Location
    Fulltimers
    Posts
    25

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    Thanks Billy! We love the interior. Makes all the work we have done on the bus worth the effort when we kick back at end of day

    Gil I will try calling PASS. I have noticed there is more documentation for this bus coming online at Prevost.
    Wiring diagrams mostly. Hopefully they are working on scanning more docs for the older busses.

  5. #5
    Join Date
    Sep 2018
    Location
    Fulltimers
    Posts
    25

    Default

    I did call PASS. they promised to get back to me in a week or so.

    Meanwhile I went ahead and charged with the equivalent
    of 4 bs of r12 and it is cooling really well.

    I will probably catch flac for this but I use a hydrocarbon refrigerant. Envirocool.
    I charged the system with 25 oz of envirocool (r290/r600 i think) basically a propane/butane mix. I used to mix it myself using coleman propane and ronson butane. This was many years ago before the envirocool was available.

    5 oz envirocool is equivalent to 13.3 oz r12

    Anyone with an old r12 system that needs a better refrigerant could check this out.
    Anyway it works good in the old bus.

  6. #6
    Join Date
    Feb 2020
    Location
    Springville
    Posts
    1

    Default

    Nice to see u using that refrigerant.most of the rest of the world new about it 50 years ago.all of my vehicles had it installed .no problems or failures in 25 years.my over the road ac and. Coach airs work great 5 to degrees cooler than 134a.never converted most of them.
    Last edited by solarchild1; 04-21-2020 at 11:04 PM.

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