Question about 1996 Mercury Grand Marquis

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My 96 meunder the mercury grand marquis is running hot

So for i replaced thermostat, radiator, radiator cap what else could it be. I noticed coolant dripping on the passenger side under the car as well.

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A cracked Intake manifold. Check the manifold in two places, on the front cross over behind the alternator and the base of the heater hose connector on the rear of the passenger side.

Posted on Mar 02, 2009


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Posted on Jan 02, 2017


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I have a 2001 mercury grand marquis ls. it overheats when im driving it but don't shows it on the temperature hand ..what is the problem ??

The temperature switch on the side of the upper radiator hose is not working. That is, if the engine is hot. Boiling over - need to check thermostat. Grab on to upper hose (should be hot) than with engine off, grab bottom radiator hose. It also should be same temperature as top. If so, thermostat ok. Electric radiator fan - turn Ac on. Fans should run. No, check fuses & relay. Mechanical fan - with engine off, the blade should be stiff to turn. Easy, replace fan clutch. Usually, low level of water is most common. Wish you well.

Apr 18, 2017 | 2001 Mercury Grand Marquis

1 Answer

How do I burp the coo long system in a Mercury grand marquis

Answer borrowed from BigNslow
Determine the capacity of the cooling system, then properly refill the system at the recovery tank or radiator opening with a 50/50 mixture of fresh coolant and distilled water until it reaches the FULL COLD line on the recovery tank or the radiator is full.

Leave the recovery tank or radiator cap off to aid in bleeding the system.

Start the engine and allow it to idle until the thermostat opens (the upper radiator hose will become hot). The coolant level should go down, this is normal as the system bleeds the air pockets out of the system.

Refill the system with coolant to the proper level.

Turn the engine OFF and check for leaks.

Mar 07, 2015 | 2002 Mercury Grand Marquis

2 Answers

My 1984 grand marquis does not have interior heat.

re check the coolant level, it most likely dropped when your engine reached temp for thermostat to open and took what you had just poured into radiator and put it in the block.

Oct 08, 2012 | 1984 Mercury Grand Marquis

1 Answer

How do i know the thermostat is going bad in a 1990 grand marquis

If anything, it might be stuck partially open. If it were stuck fully closed, the car would really overheat, like boiling hot. You might try taking the radiator cap off when it is cooled down enough, and start the car and wait till it has reached normal operating temperature, so the thermostat should be fully open. Now momentarily squeeze the upper radiator hose together as tight as you can, trying to stop the flow. Look into the radiator and see if you notice a surge of coolant when you let the hose go. If the thermostat is open you should feel the coolant surge when you let your hand go of the hose, and see the coolant coming into the radiator. Just kind of a rough test. If you aren't sure, a new thermostat is always a good idea.

Jun 17, 2012 | 1990 Mercury Grand Marquis

1 Answer

Replaced intake manifold. Now cannot get water/coolant into the radiator. How?

Rasie front of car on hill and jack stands. This will help purge air trapped in system. Leave radiator cap loose, cold engine. Run engine until upper hose is hot and burps air. Shut down, as it cools keep the radiator and reservoir full. Tighten cap and it should **** from reservoir as it cools.

Jun 21, 2011 | 1995 Mercury Grand Marquis

3 Answers

How to flush and change the antifreeze on a 2001 mercury grand marquis

loosen pressure cap slowly at coolant tank to relieve pressure,when pressure is relieved remove cap,place a suitable container under drain valve at bottom of radiator open drain valve.when coolant has stopped draining,close valve.then remove thermostat,[this is a good time to replace t.stat since it must be removed to refill cooling system],disconnect heater core coolant supply hose at rear of intake manifold.add coolant thru t.stat opening until coolant comes out of coolant supply hose fitting,reinstall hose and tighten[not to tight] reinstall thermostat o ring and thermostat.add coolant to tank until the coolant level is between the COOLANT FILL LEVEL the maximum heater temperature and blower speed settings run engine until it reaches operating temp.add coolant until the coolant level is between the COOLANT FILL LEVEL marks.turn off engine allow it to cool, recheck coolant level,add as needed .ford requires this procedure to avoid engine damage due to trapped air.

Jan 15, 2010 | 2001 Mercury Grand Marquis

1 Answer

2005 MGM - Need to change coolant

There is only one drain point. Drain the coolant from the system at the radiator. This will remove coolant from the engine. Be sure and have the heater set to hot. Flush the system with a water hose. Fill the system with a 50/50 mix of antifreeze and distilled water. Do not use tap water. Start the engine with the radiator cap off and keep adding coolant until it will take no more and you see no more air bubbles escaping from the radiator. If there are schrader bleed valves on the engine cooling system use them to remove any more trapped air. Put the cap on and start the engine and let it run for 15 minutes while you check for leaks. I would replace the thermostat at this time as it is just good preventive maintenance.

Oct 02, 2009 | 2005 Mercury Grand Marquis

3 Answers

Fan blades not turning - the main cooling fan radiator

electic fan relay or coolant temp sensor will be ur problem if its not a fuse

Jun 28, 2009 | 1996 Mercury Grand Marquis

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