Question about 1999 Mercury Grand Marquis

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Coolant leak from upper radiator hose where it meets engine

1999 mercury grand marquis overheated. there is coolant leaking from where the upper radiator hose meets the engine. most likely cause?

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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

Posted on Jul 03, 2009

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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.

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1 Answer

How do I burp the cooling 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.

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Where on a 2003 Mercury Grand Marquis is the temperature sensor


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There is not a coolant passage there.

Look for a leak above that point that is running down.

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1992 mercury grand marquis is over heating, whats the problem


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.

In any event, proper diagnostics need to be performed immediately. An overheating engine is nothing to mess around with unless you are very wealthy and can afford to replace an entire engine.

Please also review these articles:

What To Expect From An Online Car Expert

What Else Could Be Wrong?

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check the carpet under the heater core in the interior. Check the radiator overflow bottle--sometimes they get a small crack at the bottom and weep out coolant. Check for any heater hose or other coolant hose clamp to be weeping coolant onto hot exhaust parts. The coolant will evaporate and you'll never see a puddle. The best time to check is just after engine shut down when coolant temp and pressure is highest.

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1 Answer

Where is the thermostat located on a 1999 grand marquis


follow the upper radiator hose to the engine, drain the cooling system remove the radiator hose from eng, look inside the nipple the upper hose was attached to u will see the thermostat.

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1 Answer

Car overheating


if you have leaking in the cooling system the engine should ovarheat, first stop leaking.

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