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Mercury Grand Marquis

Report: Intake Manifold May Crack Leaking Coolant Behind the Alternator

Mercury Grand Marquis Problem
38 Reports

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

Average Mileage: 120,705 mi (48,500 mi - 308,000 mi)

Verified

The composite (plastic) intake manifold may crack near the thermostat housing and cause a coolant leak. Ford released an updated manifold that was reinforced to prevent a recurrence. No recall was issued for this problem but Ford did extend the warranty to seven years on some models from the date of purchase.

  • Report #1
    Visitor, 1998 Mercury Grand Marquis, 226,000 mi

    Plastic manifold cracked at the thermostat. No way to fix so no option but to replace. Dealer said it would cost $1,260 to replace (includes $400+ for the part). I bought the part on-line for $216 and did it myself. Took several hours but was not terribly difficult. Just a lot of stuff to take off, so mark hoses and wires well.

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  • Report #2

    Plastic Intake Manifold is cracked and leaking

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  • Report #3
    Visitor, 2003 Mercury Grand Marquis, 129,000 mi

    Intake manifold cracked... gonna cost a bundle to replace. It would be nice if they weren't made out of plastic! Just doesn't make a whole lot of sence to me.

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  • Report #4
    Visitor, 1999 Mercury Grand Marquis, 134,400 mi

    Repeated issues with the car overheating. Replaced the fan relay switch and then replaced the thermostat...only to learn that the plastic intake manifold has cracked and is leaking coolant.

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  • Report #5
    Profile_thumbnail
     Rookie

    need new intake manifold

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  • Report #6
  • Report #7
  • Report #8
    Visitor, 1997 Mercury Grand Marquis, 98,000 mi

    My plastic intake Manifold cracked in the very front, right behind the alternator causing most of my coolant to squirt out before I noticed it; also getting into my alternator and causing problems with it! I found a used one and replaced it myself!

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  • Report #9
    Profile_thumbnail
     Rookie

    something is leaking. I was told it from the oil intake

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  • Report #10
    Visitor, 1998 Mercury Grand Marquis, 61,000 mi

    Cracked intake manifold. Leaking Coolant.

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  • Report #11
    Visitor, 1999 Mercury Grand Marquis, 98,000 mi

    Intake manifold leak at heater hose connection and subsequently at thermostat housing. Second Mercury/Ford with this problem. After replacing intake manifold then had a/c switch problem--once inside heat used it would not go back to cool--identical problem on Ford Taurus after intake manifold was replaced on that car too.

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  • Report #12
    Profile_thumbnail
     Enthusiast

    Parked in garage after a 45 miles drive. Found puddle of yellowish engine oil like fluid on floor. Car never overheat and no problem with transmission. Engine oil, power steering, brake and auto trans fluid all check out fine except coolant low and disappeared from overflow tank. Dealership identified the coolant leak caused by cracked intake manifold. Cost $1300 to replace.

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  • Report #13

    thermostat housing unit leaking

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  • Report #14
    Visitor, 1999 Mercury Grand Marquis, 164,000 mi

    Replace with new manifold with the cracked part made of aluminum. Works like a dream.

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  • Report #15

    was replacing 1/2 gal antifreeze per month, car overheated, mechanic diagnosed crack in intake manifold at heater hose

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  • Report #16
    Profile_thumbnail
     Rookie

    Just bought the car from an elderly gentleman who was the original owner. Looked and drove great untill I got it on the freeway and it went up in smoke... or should I say steam. Manifold cracked in the exact spot and cost me $1000 to fix. This will be my car for a long time, I hope.

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  • Report #17
    Visitor, 1997 Mercury Grand Marquis, 126,500 mi

    Pool of antifreeze on top of engine block beneath the induction manifold.

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  • Report #18
    Profile_thumbnail
     Rookie

    Manifold at cylinder # 6 leaking coolant fluid causing terrible loss in power

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  • Report #19
    Visitor, 1998 Mercury Grand Marquis, 70,000 mi

    self repair

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  • Report #20
    Visitor, 1996 Mercury Grand Marquis, 69,000 mi
  • Report #21
    Visitor, 1998 Mercury Grand Marquis, 150,000 mi

    I HAVE LEAKING ABOVE SPARKPLUG NUUMBER 4 AND IT IS CAUSING A MISFIRE FOR THAT PLUG. A CONSTANT PROBLEM

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  • Report #22
    Visitor, 1997 Mercury Grand Marquis, 308,000 mi

    Purchased the Dorman enhanced replacement took about 1 1/2 to replace wiht simple tools.

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  • Report #23
    Visitor, 2003 Mercury Grand Marquis, 120,000 mi

    cracked intake, not fixed yet

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  • Report #24
    Visitor, 2000 Mercury Grand Marquis, 149,000 mi

    Heater box to intake manifold heater hose nipple stripped out at manifold. Lose about 1 gallon of antifreeze every 3 weeks. My mechanic says this is a common problem. Ford should be embarrassed and replace all for free. The engineer that designed the manifold and the manager that approved the design should own one of these cars for the rest of their lives.

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  • Report #25
    Visitor, 2003 Mercury Grand Marquis, 98,000 mi

    intake manifold started leading at the thermostate housing. haven't as of yet, due to the cost.

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  • Report #26
    Profile_thumbnail
     Rookie

    crack in the intake manifold...saw a recall on it for the plastic one to be replaced with the new aluminum, but my luck it does not apply to me because my car is to old. My mechanic is charging me 950 for the fix and said he would keep the information he found on line for this. I think Ford being a reputible company and Michigan based should step up and support all who have this problem no matter when it occurs

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  • Report #27
    Visitor, 1999 Mercury Grand Marquis, 114,200 mi

    coolant leaking behind alternator, plastic cracked.

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  • Report #28
    Visitor, 1996 Mercury Grand Marquis, 105,000 mi

    Check engine light on. Hard to start when cold, warm up couple minutes at least before driving or else sluggish acceleration. Sound of vaccuum leak but cannot locate source. Smell of antifreeze when turn on heater and/or AC.

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  • Report #29
    Visitor, 1999 Mercury Grand Marquis, 106,236 mi

    as i was filling up the radiator i notice a leak of coolant on the floor it was my water pump, I replaced it the same day. a week later i notice another leak behind the alternator it was my thermostat the gasket went bad so i replaced it and problem consisted i notice that the original factory brace was not holding the hose right so i went to a auto parts bought a new one talk to one of the guys who work there n told me that other people had the same problems with the same car, he advice me to replace all of them just to avoid same problems in the future he told me those braces once u open them they wont work again.... mechanics have told me the same thing to replaced them all

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  • Report #30
    Visitor, 1996 Mercury Grand Marquis, 122,000 mi

    had my merc for awhile now and suddenly i smelled something and then saw smoke coming from under the hood, i pulled over and saw coolent everywhere took it in and found out i have a small crack behind my alternator on my intake manifold...did lots of research and come to find out im not the only one with this problem THANKS FORD.. for a new manifold online for $210 and now im going to attempt to replace it myself after finding out having a professional do what i can figure out will be 4 to 500 just for labor so wish me luck and again THANKS FORD!!

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  • Report #31
    Profile_thumbnail
     Rookie

    had my merc for awhile now and suddenly i smelled something and then saw smoke coming from under the hood, i pulled over and saw coolent everywhere took it in and found out i have a small crack behind my alternator on my intake manifold...did lots of research and come to find out im not the only one with this problem THANKS FORD.. for a new manifold online for $210 and now im going to attempt to replace it myself after finding out having a professional do what i can figure out will be 4 to 500 just for labor so wish me luck and again THANKS FORD!!

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  • Report #32
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