Question about 1996 Mercury Grand Marquis

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COOLING HOW IT FLOWS THE WATER WERE IT GOES IN THE TOP ABOVE THE WATER PUMP BOWS OUT NOT IN AND BUILDS UP TO MUCH PRESURE AND OVERHEATS

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  • GREGG HADSELL May 11, 2010

    TOOK IT OUT. BUT SHOULDNT WATER GO IN THE AT THAT POINT.DOES ANYONE KNOW HOW THE WATER FLOWS ITS A 96 GRAND MARQUIS WITH A 4.6 L

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Coolong system flows from the top of the engine to the top rad, flows down out the bottom to the water pump then through the engine, sounds like the thermostat is frozen solid,

Posted on May 11, 2010

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Posted on Jan 02, 2017

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My 2002 buick century overheats and has no heat


Possible trapped in system. Bleed system, should have two small screw bleeders, one in front of left valve cover on pipe behind water pump and the other on coolant pipe outlet as you follow upper rad. hose towards engine. Engine cool, remove rad cap, open both bleed screws and fill rad until coolant flows free out both bleed ports. close both bleed screws, rad cap off, start engine and let idle until upper hose is hot to touch , shut off, let it cool down for 20 minutes, top up rad and install cap. restart car ,drive and check.

Jan 02, 2014 | 2002 Buick Century

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Water keeps coming out of my resavor when it starts to heat up


from what you describe either a bad radiator cap, or a leak in the small hose going to the resovoir,or the line within the resovoir tank is to short or missing,this is whats happening,engine warms up to a point that the cooling system is building pressure,the radiator cap has a set presure release to it you might see the figure direcly on top of the radiator cap, 12-14 lbs rated. it usualy will read something like that, so as that warming engine builds pressure in the cooling system it will eventualy surpass the rating of the radiator cap ,and out it goes and flows in that small line to the overflow resovoir. now when the engine cools back down it now will create a vaccum and should draw that water back from the resovoir to the radiator,but if the hose or hardline that is usualy integral within the resovoir is bad cracked or missing, it would be the same as trying to drink a soda through a straw,but the straw is not inserted below the surface of liquid.or if the straw was cracked, no fluid can be vaccumed up through the straw, the resovoir works on that same principle, it must have a good unobstructed line from radiator to the resovoir,and the line inside the resovoir should go nearly to the bottom of the tank, so the water can be vaccume syphoned out just as drinking a soda with a straw.so check to be sure the line is all good no obstructions,no cracks, and that there is a line that continues within the resovoir tank almost to the bottom as well and it is in good shape as well. last check that radiator cap to make sure the rubber as well the upper gasket portion are still there and not cracked/dryrotted. if all that is in good working order then your radiator should be able to recover the water back.just like sippin a soda through a good straw

Jul 05, 2012 | Chevrolet Malibu Cars & Trucks

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My van started shooting water into the overflow. it was more like a blockage problem to me so here is what i have tried so far with no luck. i removed the thermostat to one make sure it was not stuck and...


Your right that there is not much to a cooling system when you only look at the cooling system without noticing the other components, not really something you do much on aircraft engines cooling systems.

A water pump can have a broken or coroded impeller making the coolant flow too slowly to carry the BTU's that needs to carried off. This usually would allow the user to operate the vehicle for the normal amount of time it would take to reach thermostat opening tempurature, so if it builds presure too quickly or overheats very quickly this may not be the problem. The normal amount of coolant flow through the system depends of the speed of the waterpump at that time, and the position of the thermostat. An egine turning 3000 and a thermostat wide open would produce a flow of about 2 - 3 quarts per 10 seconds. More for larger engines like, say, a v-10 viper.

Or there may be too many BTU's for the system to contend with, like for example, a leaking cylinder head gasket, cracked head/block or something like that which would allow very hot combustion gasses to enter the coolant stream adding huge BTU values to the system as well as increasng the coolant internal presures forcing the radiator cap to "pop" and relieve the system presure into the overflow bottle. In essence, a leaking headgasket acts like a cutting torch shooting hot combustion gasses into the coolant. The amount of time it takes for the system to overpresurize or over heat is a good indicator of coolant being exposed to combustion gasses. The cooling system can be checked for combustion gasses.

Or perhaps the heat being carried is not being effectively removed from the coolant. A radiator can become "sludged" up with stuff and litterally not be able to cool the coolant in the amount of time that the coolant is in the radiator. Sometimes a coolnt flush can help this, but it is only temporary. If the engine is normally producing, say, 250,000 BTU's per minute then the radiator must be able to carry at least twice that amount away durring heat exchanging.

Here's some clarifying questions we could use to help find the problem; (be specific and descriptive)


How long can you run the engine before it either overheats or starts overflowing the coolant?

Does the system presure increase very much when the engine is first started cold?

Is the radiator cap relieving the presure at the specified value?

Do the radiator fans work when needed? If the engine overheats rapidly when started I don't think the fans are an issue unless that is why the engine overheated in the first place taking out the headgaskets.

Also, if you wish to follow up on these questions let us know what model, year, and engine you have.

Always here to help, just ask away!

Apr 17, 2011 | Chrysler Voyager Cars & Trucks

1 Answer

1995 Honda Accord, 4 cylinder, overheating issues. Only overheats when in stop and go or slow traffic. No obviously leaks from the radiator. It's also brand new. Both fans come on when the temp gauge...


You may have air in the system, find the highest spot in the cooling system .Try open a hose and if there is a bleeder opening that.If it overheating at low speeds it is a water flow problem(volumn). I would suspect a bad water pump or a thermostat stuck partially open.The timing belt drives water pump and if it is loose then that could be a problem.if you replaced the radiator because of rust then the blades on water pump could be worn.Rust is abrasive.

Feb 19, 2011 | 1995 Honda Accord

2 Answers

1997 polo overheats even after removing thermostat


On a water cooled engine... the impeller on the water pump is no longer working correctly. It has probably come loose from the input shaft and is no longer pumping water. You can prove this on a warm engine by filling the radiator to the top and then accelerating / decelerating the engine... if you don't get a change in the water level the water pump is shot.

Kelly

Feb 21, 2010 | 2001 Volkswagen Golf

2 Answers

Car overheating


You have a bad radiator fan. Check to see that your fan comes on when temp goes past half way, about 3/4.

Aug 11, 2009 | 2001 Nissan Sentra

2 Answers

Water leaking from bottom pulley


without a cooling system presure test, it's just a guess, but I would suspect the WATERPUMP

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