Question about 1999 Mercury Grand Marquis

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Water leak from top at the back of motor - 1999 Mercury Grand Marquis

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Sounds like an intake gasket leak. If you can get a mirror, it will help you see where it is coming from. It might just be a hose or a fitting but it is usually the intake gasket in the back

Posted on Oct 19, 2013

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1 Answer

Water leakin from bottom of engine


The Most common leak on the 4.3 and 5.7 are from the Bypass Hose on TOP of the Intake Manifold. It is a Quick Disconnect Fitting that corrodes and then leaks and then drains down the back of the motor.

The next possibility is a Heater Hose

Depending on how bad the leak is... If you have been running Water or a Majority Water, the FREEZE PLUGS or EXPANSION PLUGS will corrode and the water eats the metal and BAM!!!! leak

If you can provide more information, but I would start there.

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