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No Radiator Pressure!

Discussion in 'The Hokey Ass Message Board' started by Alabama, Jan 17, 2013.

  1. Alabama
    Joined: Sep 3, 2012
    Posts: 2

    Alabama
    Member
    from San Diego

    My truck was running fine and then all the sudden theres coolant around the radiator cap and runnin down the fan shroud and the overflow tank will keep filling up and not going back into the radiator. I did a pressure test and the only place coolant came out was from around the radiator cap and the pressure gauge never went up. Any suggestions please?
     
  2. deto
    Joined: Jun 26, 2010
    Posts: 2,620

    deto
    Member

    So it's coming out the cap and out the overflow and the gauge says you don't have pressure? How good is that gauge?


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  3. Sounds like you've done a head gasket and it's pressurising the cooling system. Fill it up to the neck, run it up to temp, look for continuous bubbles. That's just the first and least expensive check.
     
  4. Ayers Garage
    Joined: Nov 28, 2002
    Posts: 1,382

    Ayers Garage
    Member

    Sound like you have a bad radiator cap. or the bung on the radiator where it screws in to.
     

  5. garvinzoom
    Joined: Sep 21, 2007
    Posts: 1,169

    garvinzoom
    Member

    Sounds like a blown head gasket or crack in the head or block. If changing a cheap radiator cap gives no results pull those heads.
     
  6. Does your radiator bung have a problem? Try the pressure test kit on another car a prove the kit is good.
     
  7. Ayers Garage
    Joined: Nov 28, 2002
    Posts: 1,382

    Ayers Garage
    Member

    Even if the head gasket(s) were blown, that's no reason for the water to leak out around his radiator cap and down his fan shroud. It should purge into the overflow bottle.
     
  8. I agree with Ayers Garage, I don't think you have a head gasket problem.
     
  9. txturbo
    Joined: Oct 23, 2009
    Posts: 1,771

    txturbo
    Member

    The filler neck maybe cracked where it joins the radiator tank. You didn't say what kind/what year truck. If its a metal radiator....just have a radiator shop repair it if its cracked. If its a plastic tank radiator...get a new one of its cracked. I'm assuming you used a pressure tester that replaces the radiator cap, so that should have eliminated a leaking cap. If you pressured it up with the cap on in some other way...then its probably the cap.
     
    Last edited: Jan 17, 2013
  10. SteveUK1
    Joined: Jan 15, 2013
    Posts: 3

    SteveUK1
    Member

    Might be a stuck thermostat, happened to one of my cars once - when boiled over it looked liked the end of world but turned out to be a simple fix (worth checking 1st).
     
  11. garvinzoom
    Joined: Sep 21, 2007
    Posts: 1,169

    garvinzoom
    Member

    Yes, very true.
     
  12. I agree on it being a bad cap. My 32 used to do that when I was running a non pressurized original radiator. Not showing any pressure would lead me to believe its just a cap not holding it in.
     
    Last edited: Jan 17, 2013
  13. k9racer
    Joined: Jan 20, 2003
    Posts: 3,091

    k9racer
    Member

    Nothing to do with your radiator but how did you get the name Alabama and you are in calif????????????????? Thank you.. Bobby..
     
  14. DWest
    Joined: Mar 4, 2011
    Posts: 27

    DWest
    Member
    from Missouri

    If it is pushing water out of the radiator you more than likely have a blown head gasket.
     
  15. so what ended up being the problem?
     
  16. tbill
    Joined: Oct 21, 2007
    Posts: 303

    tbill
    Member
    from central ny

    if I understand you, you removed the radiator cap, and installed a pressure tester onto the radiator where the cap would go on. if this is the case, and the tester would not build pressure and you saw coolant coming out around this area then it sounds like the neck of the radiator is cracked.
     

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