Radiator Cap | FerrariChat

Radiator Cap

Discussion in '365 GT4 2+2/400/412' started by mrandig, Apr 26, 2024.

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  1. mrandig

    mrandig Rookie

    Jul 1, 2022
    30
    Tomball, TX
    Full Name:
    Mark
    I'm going to go ahead and ask one of the stupidest questions possible. I've tried to avoid the issue, but I can't avoid it any longer.

    The radiator cap on my 412 just will not come off. Am I missing a trick here, other than just pushing down and twisting counterclockwise? There is no movement regardless of what I try; none whatsoever. I'm afraid to go at it too hard, for fear of breaking the joint where it's attached.

    There's more to this story, which I'll save for my second stupidest question. One thing at a time however...
     
  2. raemin

    raemin Formula 3

    Jan 16, 2007
    1,903
    Lyon (FR)
    Full Name:
    R. Emin
    These do require some persuasion when they age...
     
  3. mrandig

    mrandig Rookie

    Jul 1, 2022
    30
    Tomball, TX
    Full Name:
    Mark
    So, I ended up cheating. This is actually an oil filter tool, but it worked.

    Unfortunately, what I found isn't good. The radiator is full, but we're not cooling.

    Image Unavailable, Please Login .
     
  4. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    34,254
    Austin TX
    Full Name:
    Brian Crall
    Large Channellocks.
     
  5. mrandig

    mrandig Rookie

    Jul 1, 2022
    30
    Tomball, TX
    Full Name:
    Mark
    I'm pretty sure that the cooling fans aren't working. Actually, I'm certain of it.

    This leads me to my next stupid question - where are the fuses? The owner's manual tells me which fuses I should be looking for, but not how to access the fuse panel.

    I'm a noobie. Plz be kind.
     
  6. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    34,254
    Austin TX
    Full Name:
    Brian Crall
    Passengers footwell.
     
  7. mrandig

    mrandig Rookie

    Jul 1, 2022
    30
    Tomball, TX
    Full Name:
    Mark
    Thanks Rifledriver.

    Is that under the glovebox, behind kick-panel, or behind carpet?
     
  8. mrandig

    mrandig Rookie

    Jul 1, 2022
    30
    Tomball, TX
    Full Name:
    Mark
    My third stupid question is how to get into a locked glove box (no key), but right now finding the fuses are more important.
     
  9. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    34,254
    Austin TX
    Full Name:
    Brian Crall
    Footwell. That is the place you put your feet. Do I need to come show you?
     
  10. mrandig

    mrandig Rookie

    Jul 1, 2022
    30
    Tomball, TX
    Full Name:
    Mark
    Just checking before I start pulling back the carpet.
     
  11. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    34,254
    Austin TX
    Full Name:
    Brian Crall
    Have you ever opened the owners manual? Its very clearly shown.
     
  12. mrandig

    mrandig Rookie

    Jul 1, 2022
    30
    Tomball, TX
    Full Name:
    Mark
    Yes. I didn't understand what the manual was showing me.

    It's the entire footwell. The whole thing.

    Lesson learned.
     
  13. mrandig

    mrandig Rookie

    Jul 1, 2022
    30
    Tomball, TX
    Full Name:
    Mark
    I have to assume some of these wire splices aren't from the factory.

    The fuses that I was looking for all check OK, so moving along...


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  14. mrandig

    mrandig Rookie

    Jul 1, 2022
    30
    Tomball, TX
    Full Name:
    Mark
    Rifledriver, you are correct. It was clearly shown on pg45.

    I was only looking at the fuse layout on pg107, so I was in the wrong section of the manual.

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  15. mrandig

    mrandig Rookie

    Jul 1, 2022
    30
    Tomball, TX
    Full Name:
    Mark
    The fuses check out for all three fans; we have keyed power.

    Can the fans be tested by crossing the wires at the temp switch?
     
  16. raemin

    raemin Formula 3

    Jan 16, 2007
    1,903
    Lyon (FR)
    Full Name:
    R. Emin
    If you start the AC one fan will start regardless of engine temp.

    You can short the tempswitch to test the three fans.
     
  17. mrandig

    mrandig Rookie

    Jul 1, 2022
    30
    Tomball, TX
    Full Name:
    Mark
    Thanks Raemin.

    Confirmed. All three fans do work when the wires are crossed.

    Looks like I've got a bad temperature switch.
     
  18. mrandig

    mrandig Rookie

    Jul 1, 2022
    30
    Tomball, TX
    Full Name:
    Mark
    What's the coolant that everyone recommends?

    AGIP antifreeze is listed in the Owner's Manual, but it doesn't seem to be available any longer. There's an AGIP Permanent Spezial, but I'm not sure if that's the same thing.

    It looks like it's currently filled with regular, green-flavored coolant.
     
  19. raemin

    raemin Formula 3

    Jan 16, 2007
    1,903
    Lyon (FR)
    Full Name:
    R. Emin
    mrandig likes this.
  20. mrandig

    mrandig Rookie

    Jul 1, 2022
    30
    Tomball, TX
    Full Name:
    Mark
    In the process of troubleshooting this cooling issue, I managed to snap this vacuum hose.

    Honestly, I think after 38yrs., it had been waiting to give out, and just needed a nudge.

    What is this, and how do I replace it?

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  21. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    34,254
    Austin TX
    Full Name:
    Brian Crall
    Its not a vacuum line, it is a high pressure fuel hose. Dont start the car, you'll have a fire.

    It requires some special tooling to fabricate.
     
    peterp and mrandig like this.
  22. mrandig

    mrandig Rookie

    Jul 1, 2022
    30
    Tomball, TX
    Full Name:
    Mark
    Thank you for the heads up. I came to the conclusion this was part of the fuel injection system, but not that it was a fuel line.

    I had avoided touching this car for almost 8 months. Now I remember why it's been sitting here so long.
     
  23. mrandig

    mrandig Rookie

    Jul 1, 2022
    30
    Tomball, TX
    Full Name:
    Mark
    I'm trying to decode the parts breakdown for this online, and can barely tell what I'm looking at. Is this a "bridge hose"?

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  24. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    34,254
    Austin TX
    Full Name:
    Brian Crall
    The best thing you can ever do to get the correct parts for the car is deal with a knowledgeable parts person and describe the part you need. Let him look it up.
    If you are dealing with the right person he knows way more about parts than you or me.
     
    Jaredsalinsky and mrandig like this.
  25. mrandig

    mrandig Rookie

    Jul 1, 2022
    30
    Tomball, TX
    Full Name:
    Mark
    You are 100% correct. This is going to be a steep learning curve.
     

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