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AC pressure cut-off switch for a 308?

Discussion in 'Technical Q&A' started by branko, Aug 4, 2005.

  1. branko

    branko F1 Rookie
    Owner

    Mar 17, 2003
    3,710
    Birmingham, Alabama
    Full Name:
    Branko Medenica
    Does anybody know where I might locate an AC pressure cut-off switch for an '85' 308? I have tried Rutlands, Sodacom, AW and All Italian parts with no luck. The part # is 100460. Is there a clone replacement part that will work? Any words of wisdom are welcome. Thanks, Branko
     
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  3. LarryS

    LarryS Formula Junior

    Nov 14, 2003
    302
    Fremont, CA
    Full Name:
    Larry S
    The Ferrari 4 post crossfitting from my 1984 308 requires 10mm x 1.0 pressure switch.
    Most pressure switches (like mercedes, volvo & saab) are 3/8 x 24 thread. The 3/8 x 24 switch is wooblie in the Ferrari fitting and gives you a total of .026" thread engagement, as opposed the .046" with the correct part. In my opinion, this is not acceptable, especially at 200-300psi. I wouldn't use the 3/8 x 24 switch.

    I could not find a 10mm x 1.0 pressure switch.

    I machined an aluminum adapted to go from 10mm x 1.0 to 3/8 x 24 and used the european switch.
     
  4. branko

    branko F1 Rookie
    Owner

    Mar 17, 2003
    3,710
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    Branko Medenica
    Thanks for your expertise. I'm still looking.
     
  5. Ricambi America

    Ricambi America F1 World Champ
    Sponsor Owner

    Branko -

    100460 is NLA from Ferrari and was superseded with 95320033. It's a whole receiver kit now, and pricing is still *somewhat* available from Ferrari, but the item would be sourced in Italy (3 week leadtime).

    Pricing is disastrous, insulting, criminal, or tragic... whichever adjective you prefer:

    http://ricambiamerica.com/product_info.php?products_id=261204


    -Daniel
     
  6. Mike C

    Mike C F1 Veteran
    Lifetime Rossa Owner

    Aug 3, 2002
    6,075
    Southeast USA
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    Mike Charness
    #5 Mike C, Aug 5, 2005
    Last edited by a moderator: Sep 7, 2017
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  8. atlantaman

    atlantaman Formula 3

    Mar 31, 2002
    1,726
    Roswell, Georgia
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    Charles
    when I converted my 308 to 134-a , I had to disconnect the pressure switch. the 134-a needs higher pressures to work and it just would not get cool enough at lower pressure. I wish I could find a direct replacement that was for about 25 lbs higher pressure
     
  9. Ricambi America

    Ricambi America F1 World Champ
    Sponsor Owner

    Yeah, factor in shipping, exchange rates, and import taxes, and we're probably not too far off.

    (Who brought the soap?)

    -Daniel
     
  10. barcheta

    barcheta F1 Rookie

    Nov 15, 2003
    3,705
    Hmmm. interesting I had my car converted over to 134-a last year. To the best of my knowledge they did not disconnect the pressure switch. My A/C blows about 42 degrees on high... Now I do need a new fan switch (the one on the console) ... mines wobbly and I'm afraid sooner or later it will breakoff it's mount.
     
  11. Ferrari_tech

    Ferrari_tech Formula 3

    Jul 28, 2003
    1,527
    UK
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    Malcolm W
    #9 Ferrari_tech, Aug 5, 2005
    Last edited by a moderator: Sep 7, 2017
    Mike,

    We are out of stock of # 95320033.

    If you go onto the next step on the web site it confirms that we are actually out of stock
    Image Unavailable, Please Login
     
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  13. Mike C

    Mike C F1 Veteran
    Lifetime Rossa Owner

    Aug 3, 2002
    6,075
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    Mike Charness
    Yeah, sometimes it's those small parts that are budget killers...
     
  14. Mike C

    Mike C F1 Veteran
    Lifetime Rossa Owner

    Aug 3, 2002
    6,075
    Southeast USA
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    Mike Charness
    Same here.
     
  15. Verell

    Verell F1 Veteran
    Consultant Owner

    May 5, 2001
    7,000
    Groton, MA
    Full Name:
    Verell Boaen
    My Euro '82 308 is converted to R134a, w/ original pressure switch. Also blows in low 40s once it's been running a while & gotten past the initial heat load.

    Also have converted a couple of other 308s to R134a & no problems from the high pressure switch. Don't have my conversion notes handy, but pressures weren't as much higher than R12 as I was expecting. Also the system seems to work better if I slightly under-fill with R134a which keeps the pressures down.
     
  16. sparta49

    sparta49 F1 Veteran
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    Mar 3, 2001
    7,794
    LA
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    Frank
    If you search in the old fchat archives Kelly Vince did a write up with a frigette part number that worked great. I converted my whole system in my ex-308, (compressor, expansion valve, pressure switch , drier) for under $300.00
     
  17. sparta49

    sparta49 F1 Veteran
    Owner

    Mar 3, 2001
    7,794
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    Frank
    Here is a copy of his post, I don't see the pressure switch listed in it but I know we changed mine at some poit with one we bought at the local a/c shop



    Posted on Tuesday, April 23, 2002 - 8:30 pm:

    --------------------------------------------------------------------------------
    Greg the below is what I did to convert to 134A
    This weekend at 88 I got 50 to 55 at the vent.
    Below was my problem and how I fixed it.

    In my case it was a clogged expansion valve. the drier had gone bad
    > and dumped everything into the expansion valve. Below is what I did.
    > The drier I used is a
    > SCS/Frigette
    > Part #
    > 207 805
    > XH9 DESICCANT
    > WWW.scsfrigette.com
    > Purchased at a local ACdelco AC shop for $49.00
    >
    > Expansion valve
    > Murray Climate Control
    > PART#
    > MRY 38683
    > THP AC3801C
    > UPC 9636138683
    > NO WEB SITE THAT I CAN FIND
    > Purchased at O'Riely Auto Parts for $26.00
    >
    > High and Low side 134A connectors,
    > high side $6.99,
    > Low Side $15.00.
    > Purchased at NAPA
    > DON'T buy the Aluminum cheap ones.
    >
    > 3 cans of 134A Wal-Mart $4.88 each I only used 2
    >
    > 134A O rings Assorted $5.99 Autozone
    >
    > 2 8oz cans of ester oil
    >
    > I changed all O rings. took out the 2 Schratter valves and replaced them
    > with the 134A connectors.
    >
    > I used an Aquarium air hose to drain the oil from the compressor. I
    > siphoned it out, got about 8 OZ. added the ester until it would not take
    > any more about 11OZ. Manual call for 330CC or 11OZ. I used a turkey baster
    > to add the oil to the compressor.
    >
    > Drier remember not to open or connect it to the system until you are ready
    > to Evacuate.
    >
    > Make sure the oil drier did not dump any Desiccant in to the hose going to
    > the expansion valve. this is what killed me.
    >
    > Yesterday to was 93degrees here in traffic I got 60 degrees high way 50
    > degrees. all reading from the lower vent.
    >
    > This evening 83 degrees, 86 heat index 40 Degrees at the lower vent.
    >
    > I have noticed one thing. Before my car ran at right below 195 on the
    > highway, traffic right over 195, no more than the width of the needle. Now
    > highway the needle is mid way between the 195 and the next hash mark. In
    > traffic it stays on the hash mark. This mark is between 195 and 250.
    >
    > I will double check the car tomorrow to see if I have developed an over
    > heating problem that may be unrelated to the AC. I did get a little air
    out
    > of the front radiator when I got home tonight. I'm going to drive it
    > without the AC on.
    >
    > Per Neville in England I'm going to over fill my expansion tank. It's been
    > about 2,000 miles since I have done this. When I had this over heating
    > problem before, over filling fixed it. It cooked off what it didn't need
    > and has been find ever since until now.
    >
    > OF course I am not responsible for anything that might go wrong with your
    > car in this process. This is only what I did to make it happen. And to all
    > your Ferrari Techs out there, please excuse my ignorance if I have said
    > anything that sounds stupid.. Thank God I got some common sense from my
    > father. I wish he were still here with me to take a drive.
    >
    > Kelly Vince
    > Do you have the Passion?
    > Tofosi
     
  18. branko

    branko F1 Rookie
    Owner

    Mar 17, 2003
    3,710
    Birmingham, Alabama
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    Branko Medenica
    Thanks for all the great input. Not sure which way I will proceed. Will talk to my mechanic and see what he thinks.
     

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