yes, another 348 ac thread | FerrariChat

yes, another 348 ac thread

Discussion in 'Technical Q&A' started by 348 Turbo, Jul 6, 2004.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, Skimlinks, and others.

  1. 348 Turbo

    348 Turbo Formula 3

    Jul 17, 2002
    1,837
    I looked through the achives and didn't niotice anyone else who got the "E7" code after a few minutes of operation. Anyone know the fix?
     
  2. fxbianca

    fxbianca Karting

    Apr 7, 2004
    92
    Stuart FL
    Full Name:
    Frank Conidi
    turn off the a/c for a few minutes and it will reset to your original temp.
     
  3. Ferrari_tech

    Ferrari_tech Formula 3

    Jul 28, 2003
    1,527
    UK
    Full Name:
    Malcolm W
    "E7" is the code for the fan speed control unit - unless there is a poor connection to the unit it will have to be replaced.
     
  4. 348 Turbo

    348 Turbo Formula 3

    Jul 17, 2002
    1,837
    Thanks. The fan speed control unit- Is it a separate unit, or contained within the control panel, (or circuit board). Also, how much is one?
    Thanks.
     
  5. 348 Turbo

    348 Turbo Formula 3

    Jul 17, 2002
    1,837
    BTW- Whenever I turn off the car, the unit DOES reset. It works for a few minutes, then, I get the old "E7".
    Jeff
     
  6. Ferrari_tech

    Ferrari_tech Formula 3

    Jul 28, 2003
    1,527
    UK
    Full Name:
    Malcolm W
    Jeff,

    The power unit ia available as a spare part, it's item # 2 on the drawing. It takes about an hour to replace, remove front carpet / trim in front boot-well, a couple of screws and it's done.

    The part number is 63307200 and costs £166.00 plus freight.
     
  7. 348 Turbo

    348 Turbo Formula 3

    Jul 17, 2002
    1,837
    MW,
    Thanks LOTS. I'll have a look at mine to see if, indeed there is a loose connection. If not. I'll clean the pin connectors. If this doesn't do it; you've just made a sale! You are VERY helpful. Thanks.
    Jeff
     
  8. 348 Turbo

    348 Turbo Formula 3

    Jul 17, 2002
    1,837
    ok, I finally had tiime to play with the car a bit today.
    The AC fan problem continues:
    Today, for the first time, the entire environmantal unit failed. I knew immediately it MUST be the "ol" 30 amp fuse. I uncovered it and low and behold, it was blown, of course. I decided it would be a good time to do some common sense diagnostics:
    I replaced the fuse, and unplugged the fan speed control unit. I turned on the ignition. Interesting, the entire unit was DIM. No buttons worked. I plugged it back in and viola! the unit shined brighly and all buttons worked including fan speed- perfectly. BUT not so fast!!! The fuse blew again, immediately as soon as I selected "AC".
    I repeated the experiment again to rule out od timing. Again, with a fresh fuse, all functions worked perfectly about 10 times on each button, (except of course the ac, I saved it until last). I finnally selected "ac" and POP! OK, so now what is the failed component? Some help please?
     
  9. Ricambi America

    Ricambi America F1 World Champ
    Sponsor Owner

    Definitly upgrade the fuse. Go to an audio store and buy a heavy duty inline holder -- and a fresh 30a fuse. I'm kind of a wussy when it comes to electronics, but I found my old 30a blade holders was smokin' hot -- and the lead wires were too. Replace it all, and see what happens.

    Don't forget about the auxillary A/C system in all 348ts'.... there are two latches along the upper windshield cross-brace. If you pull downward on the latches, the push upward on the roof, the system will operate in "natural mode"

    -Daniel
     
  10. 348paul

    348paul Formula 3

    Dec 27, 2002
    1,098
    Kent - UK
    Full Name:
    Paul Hill
    Jeff,

    My first inclination would be to check the current draw of the clutch on the compressor - Try disconnecting the power to the clutch and see if it still blows the fuse when turning on the A/C. Also have a look for the single wire that goes to the clutch (in the engine bay) and make sure it is in good health. (Just in case it’s chaffed or pinched and grounded out) Has the A/C worked since the engine was put back?

    Hope all is well with you,

    Cheers

    Paul
     
  11. vincent355

    vincent355 F1 Veteran
    Rossa Subscribed

    Apr 8, 2003
    6,516
    Wine Country
    Full Name:
    Vincent
    Sounds like you're going to ground somewhere, i'd follow paul's advice first and double check the wiring to make sure it's in good condition.
     
  12. 348 Turbo

    348 Turbo Formula 3

    Jul 17, 2002
    1,837
    Paul,
    Super to hear from you. I'll hopefully be back in London next month.
    I'll take your advice and check the wire for the ac clutch. If it is in good shape, I'll check the draw it creates with a digital multimeter. I'll post the group and let you know what I find.
    Since the engine has been re-installed, the car simply accellerates viciously. I think James has harnessed all 500 horses and they like to run!
    I hope all is well with you.
    Jeff
     
  13. 348 Turbo

    348 Turbo Formula 3

    Jul 17, 2002
    1,837
    Thanks for the advice, Danial.
    This is a course of action I'd not considered. I'll put it in priority order and will most likely move the location of the fuse while I'm at it. I think under the right side access cover would be a far better location than it's current one- under the carpet liner. Thanks.
    J
     
  14. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    18,044
    USA
    Here is the procedure for the fuse holder upgrade/replacement:
    http://www.ferrariforum.net/tech/view.php?id=14

    Basically, what I get from this tip, is that the fuse holder could be contributing to the blown fuse problem...
     
  15. 348 Turbo

    348 Turbo Formula 3

    Jul 17, 2002
    1,837
    Thanks for the great link! I've never been to this site previously. I'll preform this simple upgrade today.
    Jeff
     
  16. 348 Turbo

    348 Turbo Formula 3

    Jul 17, 2002
    1,837
    OK, I did the fuse upgrade. The big gold fuse looks nice, BUT after about 5 minutes of ac, (varying fan speed and multiple on-off's), the fuse blew. Next, I'll measure the draw and inspect the wire responsible for the clutch engagement. Who know's? Maybe I'll have to replace the compressor clutch?
    Has this happened to anyone else?
     
  17. 348 Turbo

    348 Turbo Formula 3

    Jul 17, 2002
    1,837
    perhaps a bit more advice from the pros?
    I have played with the car some more now. I disconnected the ac compressor control wire at the compressor itself, (small red wire going into a fairly heavy fitting, to a small green/black wire coming out). Then, I turned the iginition on, car not running, I selected fan motor on. Fine, I then selected "ac" and "pop" blew the 30 amp fuse again and the panel went dim, (not blank). No "E7" but also no control.
    Looks like a wire chase?
    Advice?
    Anyone?
    Anyone?
     
  18. 348paul

    348paul Formula 3

    Dec 27, 2002
    1,098
    Kent - UK
    Full Name:
    Paul Hill
    Jeff,

    I haven’t got the schematic to hand at the moment but from memory the green/black wire to the compressor comes form the tri-switch on the dryer. Try disconnecting the plug to the tri-switch and check with a continuity meter that the green/black wire is not grounded out. (Make sure the compressor is disconnected)

    Cheers

    Paul
     
  19. 348 Turbo

    348 Turbo Formula 3

    Jul 17, 2002
    1,837
    Wow Paul! Did you build these cars in a previous life?
    I'll pull out my schematic and check. Thanks.
    Keep the suggestions coming!
     
  20. 348paul

    348paul Formula 3

    Dec 27, 2002
    1,098
    Kent - UK
    Full Name:
    Paul Hill

    Jeff,

    I should have said, "make sure the electromagnetic clutch is disconnected" not the compressor!!

    As for building these cars in a previous life - Not that I am aware of! - Unfortunately I have this bizarre ability of remembering the strangest of things from years ago and yet sometimes have difficulty remembering what I had for breakfast!

    Keep us posted on the progress!

    Cheers

    Paul
     
  21. 348 Turbo

    348 Turbo Formula 3

    Jul 17, 2002
    1,837
    I knew what you meant. Yes, I disconnected the electro magnetic clutch. I have now chased down the schematic. I beleive the culprit to be the power supply for the fan. It is also on occastion refered to as the fan speed control. It actually has 2 sets of plugs. Oddly enough, it controls not only the fan, Environmental blow fan), but also recieves input from the relay that feeds the ever blowing 30 amp fuse.
     

Share This Page