Question about 1998 Mercury Grand Marquis

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No heat in my 1998 mercury grand marquis

No heat! The car is not leaking fluid from anywhere. It is not overheating at any time. Just no heat when heat is on only cold air comes out and it has plenty of antifreeze.

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  • 39 Answers

1. the thermostat may be locked up.
2. the heater in the dash may be burnt.
3. the relay may be bad.
now go and have this 3 things checked out.

Posted on Apr 28, 2010

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1 Answer

How to replace an intake manifold on a 1998 Mercury Grand Marquis?


This is usually straight forward but I understand there is a bolt on the drivers side rear kind of hidden between the Firewall and engine.

Also if you have an antifreeze leak on the front passengers side it is a common defect. At one time there was a Warranty for this defect.

Apr 20, 2015 | 1998 Mercury Grand Marquis

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Why is my 2006 mercury grand marquis overheating?


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
Is the water pump working right and check all rad hoses making sure they are not buckled.

Oct 04, 2014 | 2006 Mercury Grand Marquis

1 Answer

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


Hello, By doing RR most of this doesn't work. What you really is a auto technician to run some test on you car. The one test they really need to do is a pressure test on the coolant system on this Mercury GM. This pressure test will indicate if there is a leak down. That is, coolant is leaking. With coolant leaking a a closed pressurized system isn't best thing for these modern vehicles.


The coolant system is a closed system and the manufactures designed the system to hold pressure above 240 degrees. By raising the boiling point by pressurize coolant system.
This helps pollution system to operate more efficiently. GB...stewbison

Sep 09, 2011 | 1998 Mercury Grand Marquis

1 Answer

I have a 98 grand marquis it keeps overheating I changed my radiator,thermostat and intake manifold the car will drive well then start to overheat and once it overheats all the antifreeze will leak out


This could be a broken head gasket, cracked head or block.

Pull the thermostat back out and you should be able to see water flow through the radiator. Make sure the water pump is working.

Were does the antifreeze leak from?

Sep 08, 2011 | 1998 Mercury Grand Marquis

1 Answer

On my 1998 grand marquis mercury it is leaking gas on the upunder the chrome bracket near the number #1 spark plug.can u pls tell me how to fix it.


Sounds like an injector "O" Ring is leaking

You should be able to see where it it leaking from

If it is the "O" Ring , you loosen the Fuel Rail
(Chrome Bracket) lift it up off the injector to
install new one

Apr 20, 2011 | 1998 Mercury Grand Marquis

1 Answer

What are the igniton timing,firing order, spark plug gap specifications for 1998 Merc Grand Marquis with 400 cdl engine?


1998 Mercury Grand Marquis
4.6 liter V-8 VIN "W"

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I will get you the rest of the info in just a few hours...I am at work!

Aug 09, 2009 | 1978 Mercury Grand Marquis

1 Answer

Coolant leak from upper radiator hose where it meets engine


thermistate housing is the place you refer to it fuction is to hold a thermastate to open and close water flow at 150 to 190 degree according to car spectif the thermaste sticks it causes overheating and can blow the thermastate gasget, the tole cost is about 30$ at most for the thermastate and gasget...now many other things can cause a car to over heat and cause a hose leak and somtimes it is simple to just tighten the hiose clamp at the thrmastate and problem sovled see a water leak causes the radiator to lose presure and thus with out a sealed tight water cooling system the boiling point of water is lower and thus the car over heats when in doubt stop by the local gas station and have a tech take a quick look as it could be simple as the hose clamp difficult as a therm,astate but do not let it go to warp a head gasket as this blown headgasket is what is the end results of running a car to hot

Jul 03, 2009 | 1999 Mercury Grand Marquis

1 Answer

Mercury grand marquis 1997 temperature control


I'm not sure if yours is identical to mine since yours is second gen and mine is third gen, but with mine (1998 MGM), the heat was stuck on all the time. Full heat would practically cook your feet and you couldn't shut it off.

It was a servo/servo arm that controls the hot/cold mix door. The part was $15. The labor was $700. They had to take the entire dash out of the car to get at the part. Required two more visits due to a missed electrical connection to a daylight sensor and a vacuum issue that made the car stall when put into reverse.

My car had 150K on it at the time. Has 165K on it now. Still runs great and looks great. It's now my wife's auto and I drive a 2006 MGM.

Apr 05, 2009 | 1997 Mercury Grand Marquis

1 Answer

'95 mercury grand marquis enviro unit will not send heat. Fan ,ac,and breakers all good.


might be your thermostat, also make sure the fluid level is correct. it only takes a small amount of low coolant to drop the heat.

Nov 27, 2008 | 1995 Mercury Grand Marquis

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