Car Problem Reports

Mercury Grand Marquis Heater Hose Outlet May Leak Coolant at Back of Intake Manifold

Mercury Grand Marquis Problem
24 Reports
Me Too

Model Years Affected: 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004

Average Mileage: 124,141 mi (57,000 mi - 247,000 mi)


The heater hose outlet may leak coolant at the back of the intake manifold. Sometimes this is misdiagnosed as a leaking intake manifold gasket because it resembles a leaking manifold.

  • , , 247,000 mi

    Has been leaking intermittntly. While removing heater hose to check hose, the outlet pipe pulled out of intake manifold. It will not thread tightly into intake manifold. Will clean this up and use JB Weld on it.

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  • , , 119,000 mi

    Smelled antifreeze dripping from the back of the 4.6l down onto the exhaust pipe. I saw antifreeze squirting from a small pin hole in the heater hose outlet, which is pressed into the intake manifold. I cut a piece of rubber hose, put it over the pinhole and tightened a hose clamp over it . No more leak even under pressure.

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  • , , 212,000 mi

    made my spark plugs car was skipping really bad

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  • , , 66,000 mi

    broken plastic connector to intake manifold

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  • , , 98,000 mi

    Heater hose leak at back on intake manifold. Used JB weld which held until new leak sprung at thermostat housing. Darn those plastic manifolds. No recall, but there should have been.

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  •  Rookie

    I put in a "stopleak" compound and it is working fine. No leak. There was a recall on the plastic intake manifold. My car was too old to qualify. The redesigned manifold is now in aluminum I think (?)

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  • , , 156,000 mi

    refilling engine coolent daily?

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  • , , 102,000 mi

    Noticed a coolant leak first and later a misfire on cylinder 4. Found the leak at the outlet coming from intake manifold for the heater. Proceed to replace fouled coil and remove heater hose, while doing so outlet pops right out of the intake manifold. Fix still pending but looks to be jb weld is going to be involved due to the geniuses at Ford using plastic intake manifolds with metal outlets.

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  • , , 85,000 mi

    intake manifold leak

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  •  Rookie

    plastic nipple broke off tried sticking a hose that fit into hole then red heat silicone it was 2 C O P packs then 2 both the other times it popped out looking for permanent solution please

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