Question about 1995 Mercury Grand Marquis

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Repair Heater core

Heater core seems to need repairing on a95 Mercury Grand Marquis A factory installed heater core repair was done two years ago but only 1,000 miles ago ! I have the receipt. My father in law's car was recently given to me since he can no longer drive. Now I am looking at over $600 repair on a car that may be worth not more than that ! No shade tree mechanic friend will touch it. I don't trust the dealers. I am all thumbs and no mechanic by any means.  Is it true that the entire dash and possibly the steering wheel has to be taken out ( and replaced too) to fix the heater core ?Would this model have a ''quick'' access panel somewhere ?  I have found where the anti-freeze is leaking inside the car floor- board on the passenger side. I need the heater since winter is coming of course but I don't have the money due to these tough economic times at work and the nation !!  Selling  the car is out for sure since buying something smaller and gas efficient requires payments which is not possible either.  Please help as cheaply as possible as soon as possible.
What can you suggest I do to fix the problem. I read one guys advise was to read the repair manual then buy a six-pack of beer !! 

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If the heater has failed again then the heater was either defective to start with, or the technician damaged it when it was installed, this is the most likely cause fo your problem, when the heater core tubes are stabbed through the firewall it is really easy to bend them and crack the solder joints. I worked in a Ford dealer for 20 years and never saw any problem with either the Grand Marquis or the Crown Victoria. The entire dash dash must be removed and then the steering column dropped down, but it does not have to be taken out, this is a very difficult job for a trained factory tech, it is not for the do it yourself mechanic in most cases, the job will take at least 15 hours for the amateur.

Posted on Nov 14, 2008

  • yadayada
    yadayada Nov 14, 2008

    Either 2 six packs of beer or a couple of bottles of 2 buck chuck, that should make the job more fun but allot more time consuming.


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Remove steering column, pull back dash to passenger front seat, you do not have to dis-assemble entire dash panel. You can access plenum (heater box)this way.


Posted on Nov 14, 2008


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1 Answer

Heater core

I would recommend having a shop do the job.
If you want to try it buy a good repair book. The heater box on the firewall comes off and the dash comes out of the inside of the cabin.
Its a major job.

Feb 06, 2014 | 1997 Mercury Grand Marquis

1 Answer

The heater core is bad

If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing
  • The heater housing is usually under the dash and must be removed to gain access to the heater core.
  • Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
f74-01.gif The heater housing is disassembled to get to the heater core. Heater Core
  • Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
  • Remove the heater coolant hoses.
  • Remove the cable and/or vacuum control lines (if equipped).
  • Remove the heater core securing brackets and/or clamps.
  • Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
  • To reinstall the heater core, reverse the removal steps.
When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

Dec 17, 2010 | 1997 Mercury Grand Marquis

1 Answer

Heater does not work

check the heater core tubes (2 of them at the firewall) for heat. If cold, then the heater core is plugged up and will have to be flushed out, or replaced.

Check the heater fan to see if it is blowing. If it is blowing, but it is blocked by a heater blend door, then there is a problem with one of the vacuum motors or actuators, as they are known.

Good luck on this repair.

Nov 12, 2010 | 2001 Mercury Grand Marquis

1 Answer

Heater core needs replacing

The heater core on this vehicle calls for roughly 5 hours of labor time and involves splitting the evaporator case assembly, if this is your first one I would definitely think about investing in a haynes repair manual for yourself, any questions please get back to me, I'M HERE TO HELP!!!

Dec 02, 2009 | 1999 Mercury Grand Marquis

1 Answer

Heater in mercury marquis doesn't come on. Cold

Hello. The most common cause for no heat is the thermostat. This is a quick and easy repair. Go to any autozone or similar parts store for the part. They may even install it for you.

Nov 20, 2009 | 2004 Mercury Grand Marquis

1 Answer

Need to replace heater corein a 1992 grand marquis

This can be a very difficult and time consuming repair. Basically you just have to remove enough of the dash to allow access to the heater core. Go slow and do not break any parts. Take digital photos so you will be able to reassemble everything. Once you get to it, you simply disconnect the hoses under the hood and remove and replace the core, and reconnect the hoses. You then start the engine and add the necessary coolant and bleed all air from the system with the heater set to hot. This is not an easy repair and requires knowledge of how the dash comes apart. If you are not comfortable trying this then you may want to seek out a professional who has done this before on an older Mercury.

Oct 27, 2009 | 1992 Mercury Grand Marquis

1 Answer

Heater core leaking antifreeze need to replace heater core need step by step for diy. HELP!

advance has a brochure that will help or you can buy a hayes or chilton repair manual from their and it will give you step by step instructions with illistrations.

Jun 20, 2009 | 2000 Mercury Grand Marquis

1 Answer

Cost to replace and repair heater core in 99 Grand Marquis

about $1200 US, this requires the dash be pulled out, about 12 hours of labor.

Mar 24, 2009 | 1999 Mercury Grand Marquis

1 Answer

Heater core seems to need repairing on a95 Mercury Grand Marquis

in these tough times there is no time for joke especially when it is not me who is going to pay for it.

now it is true tht the whole dash board has to be pulled down in order to acess the heater core housing in the process the steering column will have to be dropped also it is aprox a job for about 6 hours but it will take a good mechanic around 8 hrs to do it if you want to avoid the anti freeze leaking inside the car the best thing you can d temporarly is to by pass the heater control valve but thee will be absolutely NO HEAT in the car i mean NO HEAT, but you will stop the antifreeze leaking inside the vehicle and of course you can drive it if you can get a small heater fan at auto zone and plug it into the cig lighter of your car!!!!!!!!!.

Nov 14, 2008 | 1995 Mercury Grand Marquis

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