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Fan Update and now confused

Discussion in 'Technical Q&A' started by 330GTCFERRARI, Aug 3, 2012.

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  1. 330GTCFERRARI

    330GTCFERRARI Karting

    Jun 21, 2012
    99
    NYC
    #1 330GTCFERRARI, Aug 3, 2012
    Okay. I pulled the two wires of the radiator fab switch and touch time together. I hear the relay click and no fans. Nice little zap though..

    Next I leave them unplugged and turn on the ac. Both fans fire right up. Anyone have any ideas?
     
  2. netman

    netman Formula 3

    Jun 17, 2008
    1,905
    OC SoCal
    #2 netman, Aug 3, 2012
    There is probably a secondary circuit to run the fans when the AC is on. When not, the fans need the temp sensor and relays to run the fan.
     
  3. 330GTCFERRARI

    330GTCFERRARI Karting

    Jun 21, 2012
    99
    NYC
    #3 330GTCFERRARI, Aug 3, 2012
    Right. Makes sense. I have been told when you touch the rad temp sensor wires together can should come on but it doesn't. So where does the fault happen?
     
  4. netman

    netman Formula 3

    Jun 17, 2008
    1,905
    OC SoCal
    #4 netman, Aug 3, 2012
    Are there 2 fans? Do you have continutiy betwen the sensor leads and the fan or relay?
     
  5. 330GTCFERRARI

    330GTCFERRARI Karting

    Jun 21, 2012
    99
    NYC
    #5 330GTCFERRARI, Aug 3, 2012
    Yes two fans. Haven't checked it with multimeter yet. To be honest not sure where the relays are. Kind of a noob
     
  6. netman

    netman Formula 3

    Jun 17, 2008
    1,905
    OC SoCal
    #6 netman, Aug 3, 2012
    I recommend two things. First check for voltage and ground at the fan. Second confirm the fan operates via bench test or swap with second fan if they are the same make and model
     
  7. 330GTCFERRARI

    330GTCFERRARI Karting

    Jun 21, 2012
    99
    NYC
    #7 330GTCFERRARI, Aug 3, 2012
    Even if they both run fine with ac? They clearly work
     
  8. Motob

    Motob Formula 3
    Professional Ferrari Technician

    Nov 11, 2003
    2,389
    Frederick, Maryland
    Full Name:
    Brian Brown
    #8 Motob, Aug 6, 2012
    There are two relays on the fuse panel that control cooling fan function. If you are looking at the fuse panel inside the engine compartment (behind the battery) towards the rear of the car, there are three relays at the bottom of the board. The 4 connector CEAM relay on the right is the main power relay. It powers up the right fuse-box when the ignition switch is turned on (the top 4 fuses).

    The middle Lucas relay is the cooling fan relay, and is controlled by the temperature switch at the bottom of the radiator. It turns on both cooling fans when the temperature switch closes. The CEAM relay on the left with 5 connectors is the right cooling fan change-over relay. It turns on the right cooling fan when the A/C compressor clutch is energized. It also supplies power to the right cooling fan when the A/C is off, but when the center Lucas cooling fan relay is energized.

    From the description of your problems, it sounds like someone had wired the relays incorrectly. Both the CEAM and Lucas relays are easy to open up and clean the contacts, but I see them replaced with non-original relays all the time. The best thing to do is get a wiring diagram, have it blown up to a size so that you can read it easily, and start tracing wires to the relays to see what is wrong.
     
  9. netman

    netman Formula 3

    Jun 17, 2008
    1,905
    OC SoCal
    #9 netman, Aug 6, 2012
    I recomemdend the fan swap as some models have multiple inputs for cooling and constant on when running AC
     
  10. Motob

    Motob Formula 3
    Professional Ferrari Technician

    Nov 11, 2003
    2,389
    Frederick, Maryland
    Full Name:
    Brian Brown
    #10 Motob, Aug 7, 2012
    Both fans work fine with the A/C on. That means the fans and wiring to the fans is fine. He just has to correct the wiring at the the two relays on the fuse board as I explained in the last post.
     
  11. anthony47

    anthony47 Karting

    May 15, 2005
    90
    #11 anthony47, Aug 26, 2012
    Did you manage to get your fans working properly?Thanks
     
  12. 330GTCFERRARI

    330GTCFERRARI Karting

    Jun 21, 2012
    99
    NYC
    #12 330GTCFERRARI, Aug 27, 2012
    Yes. Fans are all set. Had to remove the orginal relay and instal a late model relay. Th erelay was working intermitteantly. Now the problem is solved.
     

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