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2004 Mercury Grand Marquis overheating

Vehicle is overheating. When replacing the thermostat I realized that coolant is leaking at the base of the unit that is holding the thermostat. Is this a major repair or something I can do myself? It appears to just need to be resealed similar to what I did when replacing the thermostat.

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  • sincitydad
    sincitydad Jan 16, 2013

    I have learned that the leak is coming from a blown gasket between the thermostat housing and the intake manifold. Both left and right gaskets of the intake manifold need to be replaced but the part itself appears fine. What is the estimated cost to get this take care of?

  • Leigh Perlmutter
    Leigh Perlmutter Jan 16, 2013

    Sorry, but since I do all of my own work, I do not know. Get some estimates.



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  • Cars & Trucks Master
  • 1,669 Answers

If you can see a separation all around the area that seems to indicate a separate part, then you can change the seal on it...if not, the block is cracked and will need to be epoxy sealed.

Posted on Jan 12, 2013


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Hi there,
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SOURCE: how to replace starter +1993 Mercury Grand Marquis

disconnect battery,,jack car up,,put jack stand on frame,,take starter bolts out,(may not be easy),,take wires off starter,,hoped it helped,,

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SOURCE: radio wiring diagram needed

This is the only thing I could find, it is from a car audio site, hope it helps.

Car Radio Battery Constant 12v+ Wire: Green/Yellow
Car Radio Accessory Switched 12v+ Wire: Yellow/Black
Car Radio Ground Wire: Chassis
Car Radio Illumination Wire: Blue/Red
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 5′
Car Audio Front Speakers Location: Dash
Left Front Speaker Positive Wire (+): Orange/Green
Left Front Speaker Negative Wire (-): Black/White
Right Front Speaker Positive Wire (+): White/Green
Right Front Speaker Negative Wire (-): Black/White
Car Audio Rear Speakers Size: 6′ x 9′
Car Audio Rear Speakers Location: Rear Deck
Left Rear Speaker Positive Wire (+): Pink/Green
Left Rear Speaker Negative Wire (-): Pink/Blue
Right Rear Speaker Positive Wire (+): Pink/Blue
Right Rear Speaker Negative Wire (-): Green/Orange

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SOURCE: 2003 Mercury Grand Marquis radio reception problem

check the back of the radio, make sure than the antenna, connector is plug into the radio, if it is, then replace the radio.

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SOURCE: 1995 BMW 525I over heating issue. I repaired head

Hi, Sounds like you have tried about everything. Ok the aux. coolant switch is for the electric pump for the heater core will not cause an over heating condition just a longer warm up of the heater core. Has the cooling system been bleed properly if there is a trapped air pocket it will not let coolant circulate. Was the new thermostat installed correctly? They have a vent that needs to be towards the top or they trap air on the back side and cant take an accurate reading to open and close. Other areas to look at would be proper operation of the fan clutch, if they fail they can cause the fan to not lock up properly and supply enough air movement through the radiator. The aux. electric fans and their temp switches do you hear them coming on are they coming on at the right temp.

Posted on Aug 26, 2010

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SOURCE: My 1996 Suzuki Swift Cino is overheating.

Hello, if you are losing coolant as you say than the most probable place is through your head and into your exhaust system, it is highly likely you have a cracked head or a major head gasket leak. The only other place it can go is if you have a automatic vehicle with the cooler on the bottom of the radiator tank (crack between two tanks), it will go straight into your transmission, you can tell if the transmission oil is overfull and watery (thin and whitish).

Posted on Mar 07, 2011

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There are many things that can cause your engine to overheat. It could be caused by a bad thermostat, a faulty fan clutch, a defective electric fan motor (if your vehicle is equipped with one), torn/broken hoses, or a bad water pump. It could also be something much more serious like a blown head gasket, intake manifold gasket, or a cracked cylinder head or engine block. It could also be something as simple and easy as an inaccurate temperature sending unit making you "think" the engine is overheating when it actually is not.

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Hello and welcome to FixYa!

If you have overheating problem, it can lead to multiple issues. You may be running on low coolant that's why the vehicle overheats. If that's the case, please add coolant and make sure that it sits on the right level, too much coolant can cause overheating too for coolant will overflow.

The vehicle may have a faulty or worn out radiator blower motor that's why it overheats. If that's the case then you will need a blower motor replacement to resolve the issue.

If the radiator is clogged with dirt and rusts this issue occurs too. The coolant doesn't flow normally on the cooling system if it's clogged. If that's the case, I strongly suggest that you have the radiator flushed to drain out dirt and rusts. If you think that the radiator served you enough then it's better to have it replaced.

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Hope you find this information helpful enough and thank you for using FixYa! Have a good one!

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