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?
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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.
SOURCE: 2001 blazer - i have changed
check to make sure your clutch cooling fan is working.turn it by hand it should have resistance.if its real loose and leaking silicone oil replace it.
SOURCE: air slowly bubbles from radiator overflow pipe in the resovoir
well if the rad cap is damaged in any way the pressure in the rad drops its like a pressure cooker, if you open it fast it boils up on you,,,big time! so there may just be a small leak there,,its well worth having a good look at this part first pluss any other pipes and joints if all is good it could be the head gasket starting to go this can be tested for with a sniffer test
to find out if there are any hydrocarbons in the water in the rad,, its an easy test,, if there are any the head gasket is going or gone,
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SOURCE: radiator fluid boils out through the overflow tank
YOUR ENGINE TEMPERATURE SENDING UNIT NOT WORKING.ANY TIME COOLANT BOILS OUT OVER FLOW JUG.YOUR ENGINE IS OVER HEATING.REPLACE RADIATOR PRESSURE CAP AND THERMOSTAT.THERMOSTAT LOCATED IN CYLINDER HEAD FOLLOW RADIATOR HOSE IT WILL TAKE YOU RIGHT TO THERMOSTAT.THE THERMOSTAT IS IN THE HOUSING.
SOURCE: anti-freeze boils over in to res. of 2001 chevy
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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SOURCE: 2002 Honda Civic is overheating.
if its an overheating problem the cooling fans may not be coming on.this needs to be checked.it could also be a bad temperature sensor for the computer and its getting the wrong temp reading,thus not turning on the fans.there is also a cooling fan relay(not a problem that happens often).one other thing the impellers on the water pump may be worn out or not turning with the pump shaft.
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Well, everytime I check the antifreeze, it is full all the way to the radiator cap and the over flow reservoir remains the same. That's what i was thinking, that the thermostat is stuck. This blazer was great for about 3 tears and it has been one thing after another for past six months! Fuel pump, fan clutch, wheel hub, rebuilt transmission, rewired. Now it's getting hot, needs y joints, ughhh
I meant u joints
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