03 Grand Marquis coolant leak rear of engine block ...heater hose appears to be in good condition and no visible leaks. That being said I know that hose travels under the intake manifold over the block. Is it possible hose is broken in that channel?

Asked by Mar 24, 2014 at 06:27 PM about the 2003 Mercury Grand Marquis GS

Question type: Maintenance & Repair

1 Answer

25,805

There is a pipe that runs under the intake that has an o-ring seal at the back of the water pump. It happens but most common is the plastic nipple at the right rear of the intake manifold (it points straight up and the hose goes from the manifold to the heater core) We've had to change many manifolds now because of this failure. I changed an Intake tonight because the seal between the plastic Intake and the aluminum water passage across the front leaked badly. Hang on to your wallet - these intakes are quite expensive from Ford ($400) - we have to run OEM parts because we service active Police Interceptors but you may be able to pick one up on E-bay for a lot less.

Your Answer

Mercury Grand Marquis Experts

  • #1
    Tracy Hooks
    Reputation
    5,780
  • #2
    kbro
    Reputation
    2,150
  • #3
    Js08016
    Reputation
    1,880
View All

Related Models For Sale

Used Lincoln Town Car
50 Great Deals out of 1,765 listings starting at $1,000
Used Ford Crown Victoria
4 Great Deals out of 1,191 listings starting at $1,496
Used Chevrolet Impala
536 Great Deals out of 35,320 listings starting at $900
Used Ford F-150
2,609 Great Deals out of 198,113 listings starting at $1,300
Used Ford Mustang
594 Great Deals out of 36,396 listings starting at $1,200
Used Chevrolet Tahoe
744 Great Deals out of 41,778 listings starting at $1,995
Used Cadillac DeVille
1,562 listings starting at $2,995
Used Lincoln Continental
17 Great Deals out of 3,880 listings starting at $35,890
Used Ford Taurus
193 Great Deals out of 15,922 listings starting at $1,850
Used Buick LeSabre
17 Great Deals out of 1,766 listings starting at $1,000

Used Cars For Sale

2008 Mercury Grand Marquis GS For Sale
4 Great Deals out of 52 listings starting at $3,650
2007 Mercury Grand Marquis GS For Sale
38 listings starting at $2,950

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.