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Jcb 1cx boils on & off sum days goes all day & don't boil & next time keeps boiling

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An engine should not be allowed to boil. Everytime it boils it will be causing damage. You should not be driving the car until it is fixed.

The fact the boiling is intermittent points to an intermittent failure of the cooling fan to operate, though could have other causes - such as a dirty corroded cooling system. Particles of rust and dirt circulating can temporarily block important coolant and degassing ports. If the system isn't degassing properly then gas bubbles can become trapped and disrupt the thermostat operation.
If the cooling system wasn't dirty before it started boiling it probably is now.

I suggest you begin by thoroughly flushing the system with as much manual/visual checking and cleaning as possible paying particular attention to the smaller vents and ports. Ensure the thermostat is in good order and if possible fit a vented type. Fit a new pressure cap if there is any doubt about the effectiveness of the original. Once that is done it will be time to test and rectify the original fault if it still overheats.

Posted on Apr 22, 2017

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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.

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Saturn vue batter boiling blowing relays


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what fuels, and battery boiling (running or not?)
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if in my shop, out comes the AMPclamp meter, to find out
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I am not sure that I understand your question or problem. All cooling systems are under pressure by design so that the coolant does not reach its boiling temperature. Since it is a closed system pressure should be equal throughout. What is happeneing?

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I have 85 toyota have changed water pump reader cap thermostat and still gets hot boils out water but when you put cold water it's ok for the rest of day sets over night start next day gets hot ag


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1988 ford bronco ll engine cuts off while driving. I could not get it started until the next day


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1 Answer

1996 town car Heater not working is only throwing cold air?


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1 Answer

My es 300 is overheating, and bubbling but then on the next day its fine, what could be causing this just had thermastat replaced


MAKE SURE ENOUGH COOLANT IN COOLING SYSTEM. ALSO MAKE SURE COOLING FANS ARE WORKING.IF CAR SITTING AND IDLING IN A LONG TRAFFIC JAM ON FREEWAY OR ELSE WHERE.IF COOLANT FANS DONT COME ON CAR WILL OVERHEAT BOIL OVER.HAVE CAR SCAN FOR A FAULTY COOLANT TEMPERATURE SENSOR FAULT.AND CHECK THE COOLING FANS FUSE AND RELAYS.MAKE SURE COOLING FANS ARE WORKING.ALSO PUT COOLANT BACK IN TO MAKE UP WHAT BOILED OUT.

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1 Answer

Engine light goes on than next day off


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1 Answer

Boiling over


your radiator should've been changed it could be clogged and fluid can't get by. is the rad cap plastic? If so it might not be holding any pressure becuase it has over heated a couple at least and ruined the seal. hope i helped, have a nice day.

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