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Water boils out of radiator cap when the engine is switch off

Water sometimes boils out while engine is running

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You need to Change your Thermostat.

Posted on Jan 14, 2009

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Posted on Jan 02, 2017

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My 2002 saturn boils over but does not overheat sometimes i will drive across town and all is fine sometimes i will drive 7 miles and reservoir will boil over.im guessing thermistat water pump or cap


Of the water is boiling them it has run hot. There is no way around this fact. Get a compression test done first. This should reveal if any damage has been done. Then address the boiling off problem. This can be a air pocket in the line, incorrect anti freeze mixture, sticking thermostat, water pump, cap, etc.

Oct 20, 2016 | Saturn Cars & Trucks

1 Answer

2006 Chevy trail blazer. Keeps getting hot. Anti-freeze is full, overflow container is half full. Every time I turn it off can hear fluid in radiator boiling and bubbling?


Pam are you sure it's boiling? If the Antifreeze is boiling I'd think you'd see steam coming out of your reservoir as the water expands into the reservoir, but you didn't say you see anything like that.
Of course engines get hot, that's why we have the cooling systems but it doesn't sound like it's "boiling" to me with no signs of visible steam unless your antifreeze level is really low?

If it's really boiling, and you antifreeze level is good, then your reservoir should be getting filled up with expanded hot water that goes into it to catch it when it expands.

If the water isn't going into the reservoir, then maybe your antifreeze level in the radiator is too low and you need to add antifreeze?
.
Best to fill the radiator with the engine cooled down. If you ever have to open the radiator when it's hot, NEVER open it with your bare hand as you could get scolded with boiling water. Instead use a big thick towel to remove the radiator cap off a hot engine. Again, if you can, just wait until the engine cools then open the radiator cap.

With the engine cool, you can fill the radiator with a 50/50 antifreeze mix. The 50/50 mix come premixed 50 percent water, and 50 percent antifreeze. So you can throw that stuff straight into the radiator.

Non mixed antifreeze needs to be mixed 50/50. Some people use 50 percent distilled water when they mix it because distilled water doesn't have the minerals in it that may get stuck in your radiator. That's being a bit picky about it though. Tap water works fine in a pinch. The other 50 percent is antifreeze. You can mix it right in the radiator too, put in a measured amount of the antifreeze, followed by the same measured amount of water. The water pump will mix it all together when you run the engine.

Put the cap back on and run the engine and if/when the water "boils" it should go into your reservoir. If it does boil in go in the reservoir then yes...your engine is getting hot and the antifreeze is boiling.

When the antifreeze boils, it's probably because your thermostat is stuck closed. That means the thermostat isn't letting water circulate through the radiator to get cooled. Thermostats are cheap...no more than $30 I'd say for most cars. Changing them is pretty easy too as they are usually right at the top of the engine. A mechanic may charge $100 to change it....but it's an easy job on most vehicles requiring just a couple sockets/socket wrench.

Oct 03, 2016 | Cars & Trucks

1 Answer

What happens if pressurized coolant system recovery cap is missing while driving at operating temperature?


the pressurized radiator cap is there for the purpose of increasing the pressure on the coolant and thereby increasing the temperature at which the water will boil. By driving without the correct cap or with no cap then the water will boil at 100 degrees C which will be much sooner than normal so you will run the risk of overheating the engine under normal driving conditions. Because the hot water is allowed to turn to steam and evaporate quickly you will also run short of coolant more quickly. Just drop into a auto spares shop and pick up a cap for the car as the price for it will be pocket money compared to what it will cost if you don't.

Aug 20, 2014 | Cars & Trucks

2 Answers

New radiator cap, now engine over heating - subaru forester 2004


If the engine was stopped or you shut it down immediately then the possibility of damage would be remote as the piston would not be continuing to move which is where most damage occurs.. If the radiator failed a pressure test then the problem is that the radiator pressure was not high enough to prevent the boil. I will explain . Water boils at 100degrees c at 14psi (air pressure). When under pressure the boiling point goes up to well above the 100 degrees . If you have a coolant system leak the pressure will be at air pressure and when the engine is stopped the hot parts have not water circulation so the temperature goes well over the 100 degrees and so it blows off . 2 problems are present that you have to correct. Find the leak and have it fixed and secondly check that the cooling fans are working correctly. Caps come in varied pressure ratings for the radiator construction so check that the cap reading is suitable for you vehicle

Jul 17, 2013 | 2004 Subaru Forester

1 Answer

2001 Chevy Lumina. Got hot, pulled over. Reservoir was boiling over but radiator cap was cool to the touch. Let it cool off. Check water in radiator and reservoir, needed very little. Started driving and...


Sounds like your thermostat is sticking closed at times, not allowing coolant to circulate through the radiator for proper cooling. Replace thermostat.

Mar 01, 2013 | 2001 Chevrolet Lumina

2 Answers

My 2002 buick century is loosing coolant fast. When car isn't running around 60-70 mph is seems to heat up more than normal and no heat or ac will occur. Should I replace the thermostat? I noticed the fan...


it sounds like one of several problems radiator needs flushed , water pump is bad or going, thermostat is bad, pin hole in one of the hoses, cracked head, hole in radiator, hole in heater core.if core is leaking you will notice water on the floor inside the car on pasenger side. if radiator has hole when you fill radiator with coolant it will leak froom fins sometimes only when hot. thermostat bad your car will read hot and or cold always. if stuck open cold, if stuck closed hot, after about 15 20 mins of running engine will cause radiator to boil over to over flow tank.never open radiator cap when engine is hot :) burn hazard.if pump is bad or going will notice gauge reads hot intermittent or always. will boil in to overflow tank. if head is cracked will notice water comming from side of engine block or in oil when you change oil. if radiator needs to be flushed will notice scale or gunk on radiator cap
(if you think you need help or do not have tools to perform please take to a machanic)

Mar 14, 2011 | 2002 Buick Century

2 Answers

2002 kia rio 1.5, every time i drive the car i need to put about a quart of water in the radiator and fill the tank next to it. no water under the car. No water in the oil or trans. i cant find any leaks....


The water seems to leak out when the engine is running and so it is important to hve the test done when the engine idles.
So fill up and lett it idle to checck if the fault appears.
It is possible that the radiator has got a microscopic leak and is steams out at some stage for sure.
Once confirmed you wilI have to get teh radiator checked with a pressure test. check the bandages of the hose to water pump/engine.
Also the last point if the engine is heating up to oerflow off when it is running and at stops.

Aug 30, 2010 | 2002 Kia Rio

3 Answers

Overheating when driving no mixing of the coolant and oil


The three most likely thing's cause overheating are faulty thermostat,electric fan or clogged radiator. Only at has been overheat so much it boils dry that it will cause engine trouble. Most common problem's are blown cylinder head gasket or a cracked cylinder head.
mixing coolant and water depends on where the gasket has blown or head is cracked. You will first need to check if it actually is overheating. The reason is. If the head is cracked or gasket blown then you can get a false boiling which is compresion from the cylinders blows through the crack in the head or gasket causing the coolant to blow out of the radiator cap.Fill the radiator to the top leave the cap off then start the engine.If the water blows out then you will need to remove the cylinder head check the gasket is ok. If its damaged replace if not get the head checked for crack's. If no water blow's when you start it check the thermostat is working properly. To check the thermostat put it a in a saucepan cover it with water bring the water to the boil. It should open before the water boil's but near boiling-point. If its ok then start the engine again leave it running until it boils and check the fan is running. If that's ok then its radiator problem. Their is no way to check if the radiator is ok you will need to get a new one. One last point. If the cylinder head or gasket are faulty it was caused by overheating so by just fixing the cylinder head problem is not a cure it will overheat again. Check the three things I mentioned at the begining and told you how to check them. Hope this help's. Cheer's

Aug 16, 2009 | 1992 Ford Explorer

3 Answers

Coolant boiled and no check engine light!


You would need to check out the different cooling components. The radiator cap, thermostat, fan for radiator (car should run at 195 degrees), is anything blocking the face of the radiator, are any of the cooling hoses kinked or collapsed, is the water pump circulating the coolant, is thw belt still on the water pump?

May 23, 2009 | 2006 Ford Taurus

3 Answers

96 ford windstar rusty coolent and backflow bottle smells like ga


Open the petcock valve on the bottom of the radiator. Start the vehicle and turn the heater on high. Remove the radiator cap and insert a hose with fresh water running. continue this for as long as it takes the water coming out of the petcock to become clear. It could take an hour or more. Once the water is clear, shut the vehicle off, and let the rest of the water drain out of the petcock valve.
Restart the vehicle and add fresh coolant. Leave the radiator cap off and let the vehicle run until the coolant stays at the top of where the radiator cap goes, this will ensure you have bled all of the air out of the cooling system and there is enough coolant in the system. Replace the cap and you are good to go.

Please remember to rate this fix.

Feb 14, 2009 | 1999 Daewoo Lanos

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