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slow drip from radiator overflow tube

Discussion in 'Trucks [ Eighteen Wheelers ]' started by rollin coal, Apr 10, 2013.

  1. Apr 10, 2013 #1
    rollin coal

    rollin coal Road Train Member

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    Mar 29, 2008
    TN
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    Ever since my motor (C15) was inframed last fall I've had a slow drip from the overflow when the motor is running. It never did that before. Leave it running 30 minutes it'll make a damp spot on the ground about the size of a silver dollar. Leave it running several hours 5 or 6 and it'll be about 6-10' in diameter. It's not a lot of coolant but it ought not drip any imo. What could cause that? New radiator cap fix it or could it be something worse?
     
    rollin coal, Apr 10, 2013
    rollin coal, Apr 10, 2013
    #1
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  3. Apr 10, 2013 #2
    joem61

    joem61 Light Load Member

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    The cap would be the 1st thing to try. Cheapest first.
     
    joem61, Apr 10, 2013
    joem61, Apr 10, 2013
    #2
  4. Apr 10, 2013 #3
    LBZ

    LBZ Road Train Member

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    Road to Nowhere
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    I know you know this, but make sure you replace that cap with the same LB rated cap that came off of it.
     
    LBZ, Apr 10, 2013
    LBZ, Apr 10, 2013
    #3
  5. Apr 10, 2013 #4
    rollin coal

    rollin coal Road Train Member

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    Yeah I think it's a 12 but I'll call and make sure. Where the heck have you been hiding?
     
    rollin coal, Apr 10, 2013
    rollin coal, Apr 10, 2013
    #4
  7. Apr 10, 2013 #5
    beltrans

    beltrans Medium Load Member

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    Nov 26, 2008
    spokane wa
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    On my 98' 3406E Cat I have a 7psi rad cap...
     
    beltrans, Apr 10, 2013
    beltrans, Apr 10, 2013
    #5
  8. Apr 10, 2013 #6
    aiwiron

    aiwiron Road Train Member

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    Sunny Tampa Florida
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    Try a pressure test, replace the cap just for grins.
     
    aiwiron, Apr 10, 2013
    aiwiron, Apr 10, 2013
    #6
  9. Apr 10, 2013 #7
    Guntoter

    Guntoter Road Train Member

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    Phoenix, AZ
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    We replace our caps once a year in AZ, wouldnt hurt to do it but if that does not do it, put a small (one qt) catch can on the end and see if it sucks it back in after it cools. Make sure the catch can has a hose going to the bottom of it.
     
    Guntoter, Apr 10, 2013
    Guntoter, Apr 10, 2013
    #7
    rollin coal Thanks this.
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