Cooling system malfunction 94 Concorde

Discussion in 'Concorde' started by Tommy D, Oct 26, 2005.

  1. Tommy D

    Tommy D Guest

    The coolant blew out of my 94 Concorde last week. I was down about a
    gallon. Car did not overheat, but the temp gauge was nearing the red
    zone. I refilled and drove home with no problem. Since then I have
    not used any. I left the car running in the driveway for a half hour
    with no loss. I checked with the heater on and off.

    Pressure holds at 8. Cap is rated at 17. If I pressurize at 20,
    fluid blows out the cap until it hits 8. BUT I did not see any fluid
    by the radiator resevoir when the coolant first blew out. It was
    difficult to locate any leak at night. I did spot some towards the
    firewall on left center side of engine/trans.

    I don't recall if I have ever replace any orig hoses. 12 years,
    125,000 mi. Maybe it's time to do them all.

    I don't likeself healing problems because they are potentially masking
    a serious situation.

    Any Ideas?

    Tommy D, Oct 26, 2005
  2. Tommy D

    maxpower Guest

    If the fans turn on as designed and you don't see any other signs of an
    overheating problem take a good look at the radiator cap rubber seal, if it
    is cracked, missing rubber or just doesn't look right replace it.
    That cap will dump coolant out under pressure if the seal is not good , once
    it dumps out enough, the lite will turn on or the gauge will climb.

    Glenn Beasley
    Chrysler Tech
    maxpower, Oct 26, 2005
  3. Tommy D

    Steve Guest

    Well, I'd definitely get a good radiator cap. What most likely happened
    is that its been slowly boiling coolant for days or weeks since the cap
    would only maintain 8 PSI, and it lost the coolant as *vapor* not as
    liquid, hence no obvious leak. Get a decent cap on there and then
    monitor coolant level like a hawk for a while. If it continues dropping,
    then you've got other problems (which wouldn't surprise given that you
    say it was down a *gallon!* When you're that low on coolant, the temp
    gauge can be meaningless- the engine can be melting itself but with no
    coolant flowing past the sensor, it will read artifically low.) But the
    older cast-iron Chrysler engines like your 94 would have are tough
    mothers, and it may be fine anyway.

    One thing you don't mention is which engine you have- the 3.5 is a great
    engine, but it has a couple of possible coolant leak spots that the 3.3
    doesn't (O-rings behind the water pump housing, corner passages of the
    lower intake manifold gaskets).
    Steve, Oct 26, 2005
  4. Tommy D

    me! Guest

    If it is a 3.5 I would also suspect a failing water pump...... .. These like
    to "lock up" intermittently before they finally quit.. I think almost every
    one of these I have changed (I did say almost) was a "lock up" or getting
    me!, Oct 27, 2005
  5. Tommy D

    Tommy D Guest

    A new radistor cap seems to have solved the problem,

    Thanks for the replies.

    Tommy D, Oct 30, 2005
Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.