Question about 1996 Ford Contour

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Overheating ? coolant boils out of overflow tank?

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  • Anonymous Jul 16, 2008

    Dido

  • Anonymous Mar 27, 2014

    Overheating,all water goes in overflow tank wont go back out1

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Bad water pump
Leak somewhere in system/hose/rad.. will cause overheat since system under pressure with antifreeze/coolant will allow boiling point of wter to go higher
Cooling fan not operating turn A/C on and both fans should run)
Low coolant
Clogged/dirty cooling passages in radiator

Posted on Aug 06, 2008

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Check to see if electric fans turn on in front of radiator

Posted on Jul 14, 2008

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Posted on Jan 02, 2017

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SOURCE: overheating,reserve coolant tank boiling

Ford 2000 Taurus

To solve the problem you have the things to do in this order;

) When the engine is cold top off the radiator with fluid. (When the pump was replaced the fluid should have been also)
) Make sure the radiator fluid has anti-freeze in it. This is also anti boil also !
) Add fluid to the overflow reservoir.
) Make sure the drive belt was replaced on the water pump.
) With the engine running, you can add fluid to the radiator for the first minute or so. You want to get air pockets out.
) Replace radiator cap.
) Let car warm up. When it's hot you should get the radiator fan coming on.
) When it get hotter the air-conditioning fan may come on.
) If the fan does not come on, the heat sensor is probably bad.
) If all fans come on, and it overheats, you may have a bad thermostat. Trace the upper radiator hose to where it connects to the engine. That's where it located.

Do not operate the engine when it overheats, You will damage the head gaskets and cause radiator fluid to leak into the cylinders.
If you smell radiator fluid in the exhaust fumes, it may already be leaking.

Posted on May 07, 2009

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1 Answer

Why is it that overflow tank is full, while radiator is low on coolant; coolant in tank not flowing back into the radiator?


You have a coolant leak. The engine gets hot and pushes coolant out under pressure into the overflow tank.When it cools, the volume of coolant decreases, the pressure drops to the point that it becomes a vacuum. The vacuum pulls in air more easily than coolant. It's thinner. So, you keep losing coolant from the radiator which makes the engine run hotter, each time until it eventually overheats and does damage. You need to have the cooling system pressure tested. The leak will show up. Usually, it's a loose hose clamp or cracked radiator tank high up, which makes it had to see the coolant because it doesn't leak much and it boils off leaving little or no evidence. Fill the system completely before pressure testing. Remember, checking the overflow tank means nothing when checking coolant level. There's no short-cut to checking the coolant level, take the radiator cap off when cold to accurately check level. Read the safety precautions on the car but always check when the engine is cold. NEVER HOT.

Nov 01, 2017 | Cars & Trucks

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Coolant overflow boiling


is the cooling fan coming on when it is hot?

Sep 05, 2013 | Ford Focus Cars & Trucks

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Overflow tank boils when hot


Its normal for the car to have antifreeze going to the overflow tank if thats what your asking.

Aug 24, 2013 | Hyundai Tiburon Cars & Trucks

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OVERFLOW IS BOILING


If the thermostat is not opening, the engine will keep getting hotter as you drive. You could be low on coolant and have air pockets in the system which would cause the temp gauge to not be accurate. Is the radiator fan coming on when the tank is boiling ?

Jul 29, 2013 | 2001 Chrysler Concorde

1 Answer

Coolant boiling out of overflow


I just had this , it's was a cracked expansion tank on mine, got it replaced and it's fine now. Jara13

Dec 14, 2012 | 2007 Mini Cooper S Convertible

2 Answers

Overheating coolant boiling out into reserve tank


you have a blown head gasket.. doesn't have to have coolant in the oil for a blown head gasket... if hoses are rock hard when running then you have exhaust leaking into the coolant via a blown head gasket...

Jul 14, 2012 | 1998 Plymouth Breeze

1 Answer

The car was overheating i checked all hoses and replaced the thermostat the radiator it still is ovrheating and the water is boiling in the overflow tank


Answer could be a faulty thermostat,or it could be a sign that your head gasket is about to blow ,or last of all your timing could be out of sync.

Answer 2 from Inventus: It means your cooling system is funtioning properly. In a system having a coolant recovery tank, coolant in the radiator is always up to the brim, hot or cold. There is negligible or no air space. When coolant in the radiator expands sufficiently due to warming from the engine, it will squeeze past the pressure cap's bottom seal and flow into the recovery tank. (If no provision for such expansion was present, the expansion would rupture the radiator or your hoses.) Only coolant within the radiator is under pressure, and because of this pressure (together with the elevated boiling point that the "anti-freeze" permits), it normally does not boil. But once past the pressure cap's bottom seal, the overflow is at atmospheric pressure and therefore boils.
This boiling is usually unnoticed after a short, i.e., local, trip because the cooler coolant already in the recovery tank quenches it. But after some highway driving the influx of more hot overflow heats up all the coolant in the recovery tank to the (unpressurized, i.e., "natural") boiling point.
As the engine cools when shut off, the contracting coolant in the radiator sucks back coolant from the recovery tank. Fluid in the recovery tank should never be below the "full hot" or "full cold" marks, lest air be sucked in.
-- BETTER ANSWER ==
Your cooling fans are not turning on. It is not normal for your overflow tank to boil like that. It is true that your radiator is overflowing into the reserve tank, but that means yourr adiaotor is boiling. Check for blown fuses or relays for your cooling fans. IF theya re fine. run your engine for about 15 minutes and drive. When you temp level is at normal operating temp open your hood with the engine runing and see if your fans are on. If they are, then you may have a bad thermostat or a plugged radiator, or a bad water pump. If the fans are not on, get your cooling fan switch replaced if your car has one. Check your temp sending sensor

Oct 30, 2011 | Cars & Trucks

1 Answer

Hi, My car is boiling water and it goes our from the overflow pipe at the coolant level water tank. I let my car run for one hour standing on my driveway and the temperature was going to 222 and then the...


When sitting still, yes both fans on a car equipped with two fans will run. The temperature ranges you posted seem within acceptable range. That said, the water (coolant) should not boil at those high temperatures, but some overflow is expected/normal. Ensure that you are not adding pure water to the radiator and instead are premixing it with antifreeze coolant or adding premixed 50/50 that you can buy at auto stores as this will keep the water from boiling and freezing.

As an added point of information, the hose leading into the overflow jug is two-way, meaning that when the coolant in the radiator cools down enough, it creates a vacuum and pulls coolant back into the radiator.

Zach

Feb 28, 2011 | 1999 Cadillac DeVille

1 Answer

I realise my engine lights comes on high coolant temp and when i opened the hood ,the coolant was dripping from the container you fill it at,can you please tell me possible problems


Depending on your system (either sealled radiator without a cap and a pressurized surge tank or standard radiator with cap and an overflow tank) either the radiator/surge tank cap is not holding pressure and the coolant is unable to pressurized and boils at a lower temp, boiling off until you coolant level is so low the engine overheats. More than likely it is either the thermostat or water pump. Commonly it is the thermostat

Dec 14, 2010 | Pontiac Aztek Cars & Trucks

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