Question about 1996 Mercury Grand Marquis

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1986 mercury grand marquis LS overheating

My 1986 grand marquis seems to overheat after you run it down the highway for a while. The radiator was overflowing into the plastic tank which was squirting water out too. It doesn't seem to have a whoal lot of pick up and the engine started cutting out. I'm trying to sell it, and don't know where to start on fixing it. also, it's been sitting for 8 years.

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  • aubrey12 Aug 13, 2008

    This car was given to me, and the lady said she replaced the radiator before it was parked for eight years. I just replaced the fuel tank, fuel pump, fuel filter, engine oil and filter, and the transmission fluid looks clean. I had the head off and replaced some of the coolant hoses because they were squirting out coolant. I also replaced the throttle body gasket. The engine is a 302 v8 5.0L and is fuel injected. sorry I didn't include all this info before.

  • aubrey12 Aug 13, 2008

    I just replaced the thermostat today and drained the radiator - the water looked pretty brown. I put new water in the radiator and started it with the radiator cap off and after the engine warmed up, it sucked the water into the engine so i added more water to it. does that mean it's pumping correctly? I'm also thinking that the reason it doesn't seem to have a lot of pick up is because the fuel injectors are dirty. do I have to replace them or is their a way I can clean them? I don't really want to take the car in to have the system flushed because the car is only worth about $700 and I have $500 in it. is their a way I can flush it myself?

  • aubrey12 Aug 23, 2008

    thanks for all the help. I replaced the thermostat and flushed the radiater and it quit overheating. It still doesn't have a lot of power but I think its just because its old and has 186,000 miles.

    Thanks Again

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Sounds like the thermostat is stuck closed.
If the car is overheating, they will also hurt perfomance.

But after sitting 8 yrs, it's hard to say what else might be wrong.
Was it just sitting, and you threw some gas in it to get it running? Or did you go through the car first to do some maintenance? Like an oil change, flush the gast tank and carb and put in all fresh. Change the fuel filter? and the list goes on. A car sitting that long can develope some problems just from sitting. If you could list what you have and haven't done to the car before this would help.

Posted on Aug 11, 2008

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  • Coss Aug 13, 2008

    Wow, you did do a lot of really good prep work.



    So back to the original problem.

    The lack of power probably directly related to the overheating.



    Even though she said she replace the radiator, doesn't mean it didn't have time to gather junk in it.



    I would replace the thermostat, take it in, and have the radiator flushed (actually, if you can find a place that will do it, do a complete cooling system flush, not all places do). You might also talk to them about replacing the thermostat for you, so that it can be taken out, flushed, and then put the new one in, and filled and purged (just like brakes, you don't want air in the system.

    And I would look more towards a full service shop to do this, not the local quick lube.



    From there, I would look at a bad water pump. If the pump isn't moving enough volume, it will cause it to overheat.



    Let us know what you find.

  • Coss Aug 13, 2008

    Yes, there is a do it yourself flush kit (at least there used to be, haven't looked for one for a while).

    It was a T fitting you would splice into your heater hose. You hook your garden hose up to it, and let it flush the system. I think it was Prestone that made them.



    You can clean the injectors. They had a couple of different kits for doing it. Here again, trip to the local parts store to see what they have.



    Yes, if you see it moving water through the system, the water pump is probably good (won't give it 100%, but OK).

    Hold the fan, and if you can "rock it side to side", more then just a hair movement could mean the bearings are going out.



    Agreed, if you are just going to sell it, I would do just basic fixes. But be up front with who ever you sell it to, and list the work you have done. But don't warranty it past waving good bye.

  • Coss Aug 23, 2008

    You're very welcome.

    And thanks for the rating on the answer.



    Agreed, something that has 186K on the clock is not going to be burning the tires off at the local dragstrip.



    Your plan about selling it, is probably the best thing you can do.



    Have a great weekend.

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Any car sitting that long is going to have some issues. It could be several things. The thermostat could be stuck closed. The radiator could be stopped up. The fan clutch could be inoperative. The waterpump impellar could be deteriorated to the point that it will not circulate coolant. The worst would be that a head gasket could be bad and causing to overheat and misfire. The first thing to do is replace the thermostat and purge any air from the system. Use water and not coolant to verify the repair. If this solves your issue you can drain the water and fill with proper amount of coolant. I must recommend checking for white cloudy smoke from the tailpipe as it is a sure fire sign of a blown headgasket.

Posted on Aug 11, 2008

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1 Answer

My 1996 grand marquis keep overheating


there are several problem that will give this indication and your information is not comprehensive enough to make a good diagnosis
the time factor is critical as some time could be 5 minutes to 5 hours and driving is too loose as it could be at highway speeds or stop go traffic , hill work or under load
so I will give to certain conditions that will over heat the car or cause a rise in operating temperature
head gasket--check with compression test
low water level-- check at cap
faulty radiator cap--have tested
partially blocked radiator--have a flow test done
fins on cores falling off --replace radiator
overheating transmission oil--check the transmission is fully operational as high speed with out over drive in will cause a rise in temp
if in traffic --check viscous fan and fan operation if electric
if under load -check load and tyre pressures
check for brake operation- adjust hand brake to full off
run the fault codes to check air/fuel ratios and timing
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Make sure your fluid is up in the radiator. Check your thermostat. It could not be operating properly Has the radiator been flushed lately? A dirty rad will do that
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My 98 grand marquis keeps overheating i have changed mt intake manifold,thermostat and radiator my car will overheat to the fullest and then all my antifreeze will leak out


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1993 Mercury Grandy Marquis overheated


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.


Please do check the radiator hoses, If you have worn out hoses it can cause coolant leakage which can result to overheating. A tiny hole is good enough for the vehicle to overheat.


A faulty thermostat sensor can cause the issue too. If you have worn out thermostat, the fan may not trigger that's why the fan won't work when under stressed conditions. A blown radiator blower fuse can cause this issue too so I suggest that you check the radiator blower fuse and replace it when necessary.


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

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1999 mercury grand marquis occcasionally overheats, blows antifreeze out around radiatior cap & has a gurgling sound coming from passenger floor/dash area. Have replaced thermostat, hoses, waterpump,...


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