Q: Is it a blown head gasket?

asked by on

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 gauge has never gone past the halfway mark

I can't think of any other details

My car has 132000 miles.
My car has an automatic transmission.

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

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Is it a blown head gasket?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Major coolant leak

It sounds like your truck overheated and caused it to turn off. One thing that could cause it to overheat would be a bad thermostat. I would recommend having the thermostat replaced and make sure there is coolant in the...

Q: Overheating

For the sake of clarity, it is important to distinguish when the car is overheating. If it is overheating when the car is moving, then the fan clutch isn't your only problem. If the car only overheats at a stop,...

Q: Starts on the second try

Hi, thanks for writing in. The fuel pressure should be checked to see if it can hold pressure after it is shut off. If the pressure drops to zero quickly then the possible cause is the fuel pressure regulator or...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.