Question about 1999 Lincoln Navigator

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Leak in left rear of motor

I have a 1999 navigator and recently it overheated on me. I filled the radiator and found that the leak was coming from the passenger side on the rear of the motor. There is no leak unless I turn on the A/C on high. Which leads me to think, it is the condensor or evaporative cooler. I did notice that I can still run the A/C on low without a leak. Any suggestions as to where the problem may actually be is appreciated.



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  • kobejencody Aug 25, 2008

    It is not the heater core since I bypassed it awhile ago. I will check the control valve.

    Tx very much

  • kobejencody Sep 15, 2008

    I just found the problem. It is the water pump hose that goes through the intake manifold. Is there a way to change it without removing the intake manifold. It seems Lincoln went out of their way to make an easy fix it, into a major expense. Can I bypass the hose by plugging it(it is a heater hose). Or is it vital to engine cooling functions? Any help is appreciated.




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Sure sounds like a blown heater core or control valve

Posted on Aug 25, 2008

  • paul erickson
    paul erickson Aug 25, 2008

    look up above the valve cover on the passenger side there was a hose that sometime leaks . ive seen them leak and get into the rear driverside spark plug hole and cause a missfire.
    good luck



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