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Loose hose (cooling system)

Discussion in '348/355' started by 914, Jun 22, 2025.

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  1. 914

    914 Formula Junior

    Aug 17, 2014
    301
    Belgium
    Full Name:
    Maarten
    #1 914, Jun 22, 2025
    This morning upon inspection of my engine bay, i came across a loose piece of piping, running from the top of the inlet manifold to the big tubes against the firewall.

    Any idea what the function of this hose is? There is no leak as apparantly somebod tried to plug it ...

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  2. Qavion

    Qavion F1 World Champ
    Silver Subscribed

    Feb 20, 2015
    14,213
    Sydney
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    Ian Riddell
    #2 Qavion, Jun 22, 2025
    I'm guessing that pipe is what stops your coolant system blowing up when the engine is heating up.... That's why the tank is called an "expansion tank".

    Might be a bad move to block it. That top pipe (9) is probably one of the hottest parts of the system before it is cooled down by the radiators.
     
  3. lanab

    lanab Formula Junior

    Feb 21, 2016
    502
    Stockholm, Sweden
    #3 lanab, Jun 22, 2025
    It's a return hose, don't block it
     
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  4. 914

    914 Formula Junior

    Aug 17, 2014
    301
    Belgium
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    Maarten
    #4 914, Jun 22, 2025
    Ok, so i guess that will mean a new upper pipe against the firewall because the connection for the hose is definitely broken off .
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  5. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    37,010
    Cowboy Capitol of the World
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    Brian Crall
    #5 Rifledriver, Jun 22, 2025
    That hose allows air pockets to return to the header tank where the air belongs.
     
  6. m.stojanovic

    m.stojanovic F1 Rookie
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    Dec 22, 2011
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    Serbia - Niš
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    Miroljub Stojanovic
    #6 m.stojanovic, Jun 23, 2025
    Does your heater work?
     
  7. cactussed

    cactussed Formula Junior

    Mar 12, 2008
    286
    #7 cactussed, Jun 24, 2025
    That's no uncommon. You can drill the hole, tap it and then screw in a brass barb fitting. Easy job with the engine out. More fiddly with it in (but not impossible)
     
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  8. 914

    914 Formula Junior

    Aug 17, 2014
    301
    Belgium
    Full Name:
    Maarten
    #8 914, Jun 24, 2025
    Engine has to come out anyway, because the car has been in storage since 2013 ;) Ok, it has been started every couple of months, has been moved around, etc... but hasn't been registered or went for a decent drive since...
     
  9. taz355

    taz355 F1 Veteran
    Owner Silver Subscribed

    Feb 18, 2008
    6,016
    Indio Ca/ Alberta
    Full Name:
    Grant
    #9 taz355, Jul 5, 2025 at 9:57 PM
    Damaged by a poor reinstall of engine likely
     

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