Is it a blown head gasket?

Car has been misfiring and smoking from under the hood

Mechanic said I've got a small crack in radiator, need a new O2 sensor, and a blown head gasket.

I put some k-seal in the radiator (if you don't know what it is, look it up, it is different than other stop leak products)

Mechanic replaced the sensor

If I idle the car for about 20 minutes a small leak starts to show on the side of the top of the radiator. 10 minutes later steam will start pouring out the overflow along with coolant.

There is no white exhaust coming out of the tailpipe.

Car isn't misfiring anymore

Temp ga

Experienced mechanics share their insights in answering this question :
Hello. If it leak shows up after 20 minutes of the vehicle running even after you put the k seal in you will still have to replace the radiator because the k seal isn’t properly doing its job in fixing the leak. The best way to tell if a head gasket is bad is by testing it with the head gasket test kit or a block test kit. A technician such as one from YourMechanic will be able to perform a head gasket test on your vehicle as well as evaluate the rest of your cooling system to find any faults that may be present.

You are able to find a technician and book an appointment for your overheating inspection here
https://www.yourmechanic.com/services/car-is-overheating-inspection

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

If the head gasket fails between a coolant channel and one of your engine`s combustion chambers, the engine may start to consume coolant. This can lead to the engine overheating, too, due to an insufficient coolant level.
Yes it can. It can add pressure to the coolant system to the point the radiator starts to leak. Then you`ll need to replace the head gasket and the radiator.
your heater isn`t working: your car`s heater relies on warm engine coolant in order to work. a low coolant level, caused by a leaking head gasket, can result in an nonfunctional heater.
There is an easy way to find out if your engine`s head gasket has blown. Simply check under the oil filler cap. If the gasket is not damaged, the inside of the oil cap will be mostly dry. If you discover a milky brownish-yellow substance that is similar to the thickness of a milkshake, you probably have a gasket leak.
A blown head gasket is a serious issue, as mechanical problems in the vehicle may have caused the problem and will need fixing. In addition, the head gasket problems may have caused engine failure or serious damage to the engine components, and that situation will need addressing.
When a gasket fails it can do serious damage to your car, so it is important to know the warning signs and what you need to do to get it fixed. Depending on how severe the leak or perforation is, a car usually does not last longer than a month with a blown head gasket.
You can also try performing a compression test of your engine to find a head gasket leak. If your head gasket is blown, it will allow the compressed air in 1 or more cylinders to bleed off into the cooling system lowering the compression in that cylinder.
One of the most common causes is a blown head gasket, in which the air pressure inside the cylinder heads is transferred to the cooling system. This escaped air causes bubbling in the coolant/antifreeze reservoir, which can often be mistaken for boiling.
Most engines will blow a head gasket when the coolant temperature has reached 260 degrees or more.
When idling, the engine relies on coolant water to cool it down. But a blown head gasket causes the coolant to flow into the engine block and get combusted. You`ll also notice that the coolant level drops and the engine overheats.
But there`s a more urgent issue to be aware of if you`re driving with a blown head gasket: if the coolant is leaking, then it`s no longer available to cool down the engine. Without this support, the engine will soon overheat if you keep driving – leading to further cracking and damage to your engine.
Oil and coolant leaks are common issues on many vehicles. Just because you see a leak doesn`t mean you have a blown head gasket. If you see the majority of the oil or coolant seeping out from the engine block though, it could be an indication that the head gasket is no longer maintaining a seal.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

i have a 1994 z28 and i did a head gasket replacement for some blown head gaskets. I then tried changing the timing gears and when
ANSWER : Hi there. It really depends on the location of the motor (meaning if it’s installed in the vehicle or loose and on an engine stand), that would factor into the price and whether this is a project one of our mobile mechanics can complete. We can complete the oil pan gasket replacement, but some of the other jobs like wiring harness, intake and rocker arm installation is outside of our scope of service. In regards to estimates for those services, I would suspect it would cost anywhere from $400 to $1,000 based on where it’s completed and what supplies would be needed.

Read Full Q/A … : Is it a blown head gasket?

How to check which (valve/head)gasket is not working& what is the price to fix head gasket ?
ANSWER : The problems you describe (leaking radiator, overheating) often lead to a "blown" or leaking head gasket. For your vehicle, there is only 1 head gasket, which would need to be replaced. This is in addition to any failure of the radiator or other cooling system components.

I recommend having a YourMechanic mobile, professional mechanic come to your location and perform a car is overheating inspection. This inspection will identify failed cooling system components (radiator, head gasket issues) and recommend/quote needed repairs.

Read Full Q/A … : Is it a blown head gasket?

Changed head gasket car won’t start.
ANSWER : Hi there:

In most cases when a cylinder head gasket has been pushed due to overheating, it can cause additional damage to valve train hardware; most of the time problems with valve guides. However, if you’ve double checked all hardware; you might want to look into the ignition system; perhaps the crankshaft position sensor is damaged (which happens most of the time during an overheating issue). If you can’t find the source of your issues, feel free to contact one of our local mobile mechanics and have them complete a car will not start inspection; so they can help you diagnose the problem.

Read Full Q/A … : Is it a blown head gasket?

Honda Civic 2008 after replace blown head gasket car take long to start
ANSWER : If vehicle is hard to start after the engine head was removed then you may need to double check the timing of the timing belt was set correct and the engine has no codes for the cam sensor set because of it. You may have timing off one tooth. You should also check engine compression.

Read Full Q/A … : Is it a blown head gasket?

Can bad intake manifold blow a head gasket? 2010 Toyota Prius
ANSWER : Hello – it is unlikely a bad intake manifold gasket will cause a blown head gasket on a Prius (different story for GM V6 engines). It is possible that a failing head gasket can cause a misfire over time – coolant can start to leak into the cylinders causing a misfire. The mileage level on your engine is within the range of reasonable head gasket failure. I would recommend an engine inspection by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, confirm the diagnose for this problem, give you an accurate assessment of damage and cost estimate for repairs.

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Can a blown head gasket cause a map controlled thermostat not to open?
ANSWER : Hi there. Although a blown head gasket can cause multiple systems to fail throughout the vehicle, is less than likely that it would impact the operation of the thermostat on the radiator. However, it is quite possible that when the original overheating issue that likely caused the head gasket failure occurred, several electrical harnesses or sensors that control and monitor these components may have been damaged. Coolant can overflow for many reasons, but typically it’s due to having coolant that is not thinned down to the recommended 50/50 ratio of coolant to distilled water when adding coolant to the radiator.

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I think it has a blown head gasket I was wondering for now if Bar’s Leak Block seal and head gasket repair would help til I could
ANSWER : Hey there, thanks for writing in about your 2001 Chevrolet Impala. The stop leak is only temporary and may not even work the first time. If you use too much or not as directed it may block the radiator and coolant passages and cause further trouble. If you’d like to try sealing it, only go on very short drives to test it out to see if it contains the leak well.

Read Full Q/A … : Is it a blown head gasket?

My truck overheats, blown head gasket.
ANSWER : Sorry, but there is simply no reliable quick fix for a blown head gasket. I am not a fan of "mechanic in a can". They rarely work, and when the do, it doesn’t usually last very long. Many sealants work or cure when they reach air at the source of the leak. The additive can’t tell the difference between air outside of the system and air inside of the system. This can cause the sealant to essentially plug portions of your heater core and radiator when there is air in the system.

With a blown head gasket, combustion gasses are forced into the cooling system and the air pockets it creates are where the plugging can occur. Overheating can occur when coolant does not flow as the designed pace through the system. When there is air in the coolant system, cavitation occurs causing the water pump to have nothing to push against and coolant flow momentarily stops or slows down to the point that the cooling system can’t properly remove the heat. This happens more often at higher speeds.

Your first step is to repair ALL the leaks your vehicle has. Do not rely on the overflow tank to show the correct level with a leaking heater hose. As your engine cools, it is designed to create a slight vacuum to pull coolant from the overflow bottle into the radiator. With a leaking system, the vacuum simply takes the path of least resistance and pulls air into the system through the leaking area. After all leaks are repaired, the rest of the system should be inspected and tested to ensure the thermostat, water pump, and other components are in good working order. A certified technician, like one from YourMechanic, will have the tools and knowledge to properly test and diagnose your cooling system.

Read Full Q/A … : Is it a blown head gasket?