Leave your vehicle running until all of the bubbles have exhausted out of the coolant reservoir. When it is steady with no bubbles, then your system has been bled of air.
Last but never least, the dreaded head gasket. You can damage the head gasket if you cause the vehicle to overheat without repairing the cause of the overheating problem. In the case that the head gasket is damaged, it will let pressure from the cylinder into the cooling system.
These gases slip by the head gasket allowing this pressure to escape the cylinder. It will seem the coolant is boiling, but it is escaping gases that are causing bubbling. If you are looking for a way to find out if it is the head gasket or not open your engine oil fill cap.
After you open the engine oil fill cap, look under the lid and look to see if there is any white and frothy oil sitting under there.
White and bubbly oil is an excellent indication that there is water in your oil. You do not know what is causing the coolant to boil at this moment. So the first thing you need to do is to check the temperature of your engine. To do this, you need to look at your temperature gauge on the driver gauge cluster. If your engine temperature is in the red area, you will need to turn your car off immediately. If your vehicle is not overheating, but the coolant is still boiling, you will need to open the lid to the coolant reservoir.
Please take notice that I said the coolant reservoir and not the radiator. You never want to open your radiator cap unless your vehicle is cool and has not been running. This will prevent any pressure and heat buildup in the system, which saves you a big headache. Yes, it is terrible for your car to have the coolant boiling. Without knowing why the coolant is boiling, you will not know if the problem is the engine overheating or you have a blown head gasket. First, you need to find out why it is boil in, to begin.
Once you find out which part is at fault, then you can replace this part to correct the problem. Make sure to follow the other sections to diagnose the part at fault. The cost of the repair is why many people sell their vehicles if it needs a head gasket replaced and their car is not worth much, to begin. I cannot count how many cars I have seen though that diagnosed for a head gasket, and it was something else in the system.
My brother thought he had a blown head gasket as well one time as he called me to freak out about the price. I epoxed the hole and the leak ceased.
When I started and ran the van for a while I noticed the reservoir coolant boiling along with some gurgling sounds. Turned the van off, cooled it down, topped of the coolant and started it back up. Reservior still boiled but van was not over heating yet. Could not detect any leaking this time. Fan worked fine too. Still detected no further leaks but coolant in reservoir still boiling.
Can air in the system make that happen or is it the gasket? The head gasket. That would indicate a blown headgasket. Of course the head could be cracked. Rod, the OP asked for our opinions, not just yours. I was adding a bit of clarity to your suggestion.
Why are you trying to start an argument? Thanks guys. I suspect it is the head gasket but I hope it can somehow be an air bubble. This will bleed any air from the radiator and cooling system before you replace the pressure cap. Read our comprehensive guide on how to do a coolant flush. Use the links below to jump to the section you need or read on for the complete guide.
Why does air in the cooling system cause overheating? How does air get in the system and how I can fix it? How does air get in the system and how can I fix it? Moreover, this applies to both the coolant tank cap and the radiator cap.
Because of this, the pressure in the cooling system becomes equal to atmospheric pressure, and consequently, the boiling point of the coolant decreases. To restore the performance of the cooling system, and continue to prevent a situation where coolant boils, it is necessary to revise the above causes by the probability and frequency in which they fail.
Often, boiling occurs when the car is moving in a low gear, or when the engine is running at high speeds, for example, when driving for a long time on a long journey or in city traffic jams in the summer heat. The situation is worse if the air conditioning is turned on, since it puts additional stress on the cooling system, in particular, on the main radiator.
Therefore, before going on a long drive, be sure to check the condition of the engine cooling system, including the level of antifreeze in it. Often the cause of the boiling coolant can be the formation of air in the cooling system. Symptoms of its formation are problems in the operation of the thermostat, coolant leakage, problems with the pump. Therefore, if at least one of the listed problems is on your car, then it is recommended to correct the situation, since ignoring it can do harm to the engine.
The consequences depend on how overheated the engine is. And this, in turn, depends on the brand of the car engine power and body mass , the engine, as well as the time between the boiling of the engine and its stopping the moment when it began to cool down. So, if the engine overheats slightly up to 10 minutes , slight melting of the engine pistons is possible. However, they can change their geometry. In most cases, this situation is not critical, except if there were problems with the geometry before.
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