94 Concorde 3.5 L over-heating problem. Zoomed to top of scale veryfast.

Discussion in 'Concorde' started by usethisone2007, Sep 2, 2008.

  1. I had been night driving about 30 minutes when I looked down and
    noticed the temp gauge had red-lined all the way to the top, without
    me even noticing it. It couldn't have been more than two minutes till
    it had topped out. Then the check engine light came on. I was driving
    in an area where I didn't want to stop so I kept on for the next mile
    or so until I got the car into the driveway, when it shut itself down,
    with a terrible rattly sound.

    This is a rural area so I consider myself lucky to have gotten it

    I opened the hood and noticed steam, though not sure exactly where
    from. As it was late, I just left the car to sit overnight. Next day I
    checked the oil (down about 3/4 quart, seemed typical) and 'low/no'
    coolant in the reservoir. I started it just to see if it would turn
    over, which it did just fine. I topped the oil off and added as much
    water as the reservoir could take..about 6-7 quarts went in..it takes
    12 quarts total).

    It started fine, ran up to regular temp at idle and per the hose heat
    test, the thermostat seemed to be working ok. I have brought it up to
    running temp twice since then (about 20 minutes, once driving, once
    idling) and it seems to be running normal as could be. No engine noise
    at all.

    My question is what might have made it spike like that and would the
    next thing be to replace the thermostat/gasket?

    Could it have been a sensor of some sort?

    The car has seen very limited local use throughout its life, but has
    been driven moreso during the past year. Its just hit 40,000.


    usethisone2007, Sep 2, 2008
  2. usethisone2007

    rob Guest

    its possible your water pump impeller is loose on the shaft. has it ever
    been replaced? its turned by the timing belt. if its never been done, i bet
    your car is due for both to be changed.
    rob, Sep 3, 2008
  3. usethisone2007

    aarcuda69062 Guest

    Low on coolant.
    I'd find the coolant leak first.
    If it's leaking coolant.
    aarcuda69062, Sep 3, 2008
  4. usethisone2007

    Steve B. Guest

    My first guess would be the same as aarcuda's. You ran low on
    coolant. Keep an eye on the temp gauge and the water level. If the
    water level drops find out where it is going.. Leaky hose, leaky
    water pump, leaky radiator.

    Steve B.
    Steve B., Sep 3, 2008
  5. usethisone2007

    Steve Guest

    Believe it or not, my wife even had a 3.5 water pump seize up, but the
    timing belt continued sliding on the WP pulley without even making any
    screeching sounds. Took a bit of diagnosis to figure out why it was
    overheating for no apparent reason, until I caught a whiff of burning
    rubber smell coming from the timing case cover. When I got it apart, the
    back side of the timing belt was badly glazed from the friction and the
    belt was obviously not reusable, but it wasn't shredded. I wouldn't have
    thought it possible.
    Steve, Sep 3, 2008
  6. usethisone2007

    rob Guest

    yeah mine was doing that as well at the end. heard a nasty noise coming
    from it. dead giveaway.
    rob, Sep 3, 2008
  7. Thanks for responding.

    I was wondering about how thermostats typically 'go out' though.

    Is it all at once or do they just not work all the time? I will
    probably put a new one in as its a very cheap part and easy to do, but
    I won't really feel too confident about driving it without knowing the
    old one was the issue.

    I will do the boil test on it I suppose.

    Regarding the loss of coolant. Could that have been cause by the boil
    over/steam I witnessed when I opened the hood? The temp gauge hasn't
    read hot until that one, and so far only, time.

    usethisone2007, Sep 4, 2008
  8. usethisone2007

    aarcuda69062 Guest

    When was the coolant last checked before the incident happened?
    aarcuda69062, Sep 4, 2008
  9. When you said yes, which were you saying yes to?

    It probably hadn't been checked for a couple months.

    I've since driven it quite a bit more, probably a good 30 minutes
    freeway speed, then a 30 minute cool off time, then back 30 minutes.
    The needle functioned perfectly, no overheating.

    I can't be sure how much coolant was in there when the incident

    I bought the thermostat as it was only $7, but I'm now thinking about
    not putting it in yet...because it may have just been low on
    coolant......and it somehow went off. Someone looked at the engine and
    claimed it was so clean he didn't suspect any burst hoses or leaks.

    usethisone2007, Sep 5, 2008
  10. usethisone2007

    aarcuda69062 Guest

    That's a poor maintenance practice.
    You'd have a much better direction to go if you checked it regularly and
    knew that it was full just X days ago.

    The O-ring that seals the water pump to the right side timing belt cover
    and the identical o-ring that seals the timing cover to the engine block
    were a known failure point, as were water pumps themselves up until
    (IIRC) 1997 when they and the timing belt were superceded with the late
    model items.
    I find it hard to believe that a failed thermostat caused the 50%+
    coolant loss unless you totally didn't see the warning gauges/indicators
    and kept driving and driving, in which case, I hope more drastic damage
    didn't occur.
    aarcuda69062, Sep 5, 2008
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