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How can i stop coolant bottle from boiling and bring out coolant?

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Mix new/ fresh coolant correctly, insure water pump is pressurizing system, ensure thermostat is opening, and then ensure that you have flow throughout your system.

Note: If you have a blown head gasket, your coolant may not actually be boiling, but releasing the compression from your cylinder(s) into your cooling system and blowing air out of your reservoir.

Posted on Nov 22, 2013


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1 Answer


That is a coolant recovery tank not an excess water bottle. You either have air trapped in the cooling system because you failed to purge the air correctly or you have a leaking engine head gasket.

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What could be the cause why my toyota paseo 1991 keeps on boiling in the overglow bottle even though my car is not overheating

I doubt it's actually boiling over. More than likely you've blown the head gasket on the car and the pistons are pushing compressed air back into the water system and it coming out the bottle. If you continue to drive the car the gasket will deteriorate and the coolant will start to get into the cylinders and oil. At that point you may be looking at crank bearing damage and a warped or cracked head.

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Temperature normal but radiator bottle boiling in my golf 4

If your radiator coolant is boiling then do not drive as your car could/will overheat and cause some serious damage

The temperature gauge in the Mk4 Golf is'nt that accurate, it will usually stay in the middle until you've got a major problem, where the coolant is boiling and expanding so if it's just slightly overheating, the gauge could show as normal.

The problem could be caused by numerous things such as a leak/crack in the coolant system and isn't pressurized such as a faulty coolant bottle cap not sealing properly, could be a problem with the fans, or and issue with the temp sensor /thermostat can cause confusion. It's hard to diagnose without seeing. I would take it into a garage for further inspection.

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2002 freelander land rover coolant boiling in reserve tank

Hi there the common problem found with your car is one thermostat sizes and will not let the water pass threw this in turn will cause boiling in the head and overflow bottle .2nd have a look at water hoses around engine and radiator they leak a bit , if no leaks are found my guess thermostat

Jan 27, 2014 | Toyota Cars & Trucks

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Mine got hot did not boil was low on water have filled up both bottle and engine but dont kno if its ok now

Most likely you have a failing heat gasket
& the coolant is going out the exhaust

I would stop using it & your choice on how
to approach the diagnostic part,you take apart
or get out your check book for a local shop

The overflow tank does get warm but only from
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This can be caused by a defective radiator cap or improper coolant mix, it should be 50/50.

Jun 27, 2012 | 2008 Ford Ranger

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Hi my 2003 chevy avalanche low coolant light is coming on but coolant level is good ,and my water is boiling out of the coolant bottle ,

Hi and welcome to FixYa!

You may have a faulty radiator blower motor. If the blower blows weak it will surely be not enough to make the engine cooled down. One good reason the water boils on the bottle. Another issue can be a clogged radiator and a faulty water pump. These can make the engine hot too when faulty. Please give enough attention on the possible causes to prevent severe damage to the truck.

Hope this helps and thank you for using FixYa! Have a good one!

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Anti-freeze boils over in to res. of 2001 chevy venture won't return to radiator. van over heats

Sounds like a blown gasket. The pressure at combustion chamber varies from 75 in idle up to 150 in higher RPM. If the cylinder head gasket is blown, then gases are blown into the cooling system, increasing the pressure, the radiator cap pressure relief valve is open and coolant is discharged in the coolant bottle. In such cases it is common for the coolant bottle to boil. You can observe gases discharging in the bottle, mixed with coolant, from the cooling system. These are symptoms of a blown cylinder head gasket.
To find it out you have to perform cylinder compression test on your car. Start with a normal ("static") compression test. If you will find low or zero pressure in one cylinder this might be a bad ring, valve or cylinder head gasket

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It could be that the radiator cap seal had perished and it is not holding the system pressure as the engine warms up. The spitting out will usually occur when the engine is stopped and the residual heat in the engine can result in boiling of the coolant inside the engine. Replacing the cap should fix the problem.

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Most likely it will cause overheating. The system uses pressure to raise the boiling of the coolant. Boiling coolant does not cool

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