---
title: "What Causes a Blown Head Gasket"
description: "Waiting to fix a head gasket problem can cause further damage and added repair costs. Quickly assess the situation and get your vehicle motoring again!"
date: "2020-11-24"
modified: "2021-03-19"
authors:
  - name: "Chris Teague"
    job_title: "Contributor"
    link: "https://www.thedrive.com/authors/chris-teague"
url: "https://www.thedrive.com/maintenance-repair/36858/what-causes-a-blown-head-gasket"
categories:
  - "Maintenance & Repair"
  - "The Garage"
tags:
  - "commerce"
  - "NoAds"
---

# What Causes a Blown Head Gasket

![](<https://www.thedrive.com/wp-content/uploads/images-by-url-td/content/2020/10/Depositphotos_30053633_xl-2015.jpg>)
*\<em\>www.thedrive.com</em>*

Nearly everyone has heard the words “head gasket” at some point in their life, but nowhere near that many people actually know what one is or what it does. The head gasket is a seal that lives between the engine block and cylinder heads. It creates a seal to contain the internal combustion processes taking place and prevents coolant and oil from mixing in the engine.

When a head gasket starts to go bad, it can cause all sorts of other problems with the engine and exhaust systems. Any number of things can cause the head gasket to fail, from age to an overheated engine, to even a poorly installed gasket itself! No matter the cause, the problem [requires immediate attention](<https://www.thedrive.com/news/31362/disgusting-block-of-gelatinized-engine-oil-sent-this-chevy-cruze-home-on-a-wrecker>)—*ATTENTION, THIS IS NOT A DRILL*.

*The Drive’s* researchers and editors have been through the ringer with blown head gaskets before. We can tell you that taking your vehicle to a professional is the best way to get your [head gasket issue diagnosed](<https://www.thedrive.com/article/17246/the-cause-of-the-ford-focus-rs-head-gasket-issues-has-been-discovered>) and either have a new one installed the right way or, well, learning you need a new car. Even so, we’re excited to share details on what causes head gasket failure and what you can do when you have problems with yours.

Let’s get started!

![Your engine has a variety of gaskets.](<https://www.thedrive.com/wp-content/uploads/content-b/message-editor/1605546872235-depositphotos_99671364_xl-2015.jpg>)
*Your engine has a variety of gaskets., *Depositphotos**

## What Can Cause a Blown Head Gasket?

### Overheating

One of the best ways to prevent a catastrophic head gasket failure is to keep your car at the proper coolant levels. But even when properly filled and maintained, an overheating engine can occur and blow your head gasket!

### Warped or Cracked Block or Head

An engine that has overheated can warp or crack due to the way heat distorts and changes metals. This can change the way the head gasket seals, which can lead to leaks.

### Age

Over time, the head gasket’s seals can break down and not do their job as well to prevent leaking and other problems. It’s best to learn when the manufacturer prescribes it be replaced and do so either before or right when you hit that mileage.

### Improper Installation

If the head gasket or coolant system has been installed or repaired improperly, leaks and problems with engine temperature can become big issues.

## What Are The Symptoms Of A Blown Head Gasket?

### Oil or Coolant Leaking

If you notice coolant or oil leaking on or around your engine head and block, it could be an indication that your head gasket is no longer sealed.

### Overheating

If a head gasket blows, even slightly, the engine might not be able to cool itself down to acceptable driving levels. Overheating could damage several components within your engine, so immediately turn your vehicle off until you can determine the source of the issue. One thing you should never do when your car is overheating: Remove the radiator cap and check the coolant. That’s how you get a one-way ticket to the ER for a scalded face.

### Engine Misfiring

For an engine to work correctly, spark, air, and fuel have to consistently work together with the precision of a Japanese sand artist. It has to be the exact amount of air mixed with the exact amount of fuel ignited with a specific spark voltage at a specific time. If any of these factors are off by a theoretical grain of sand, you could get preignition, [knock](<https://www.thedrive.com/cars-101/35148/what-is-a-knock-sensor>), or misfiring. More than one of these factors could be affected by a blown head gasket.

### Water Vapor or White Smoke Coming From Exhaust

If your head gasket is bad, coolant might work its way into the engine. If this happens, you could see white smoke or water vapor coming out of your exhaust pipe as a result.

### Milky Oil

If you notice tan or milky colors in your [oil](<https://www.thedrive.com/maintenance-repair/34998/how-often-to-change-oil>), you might have a blown gasket—the underside of your car’s oil reservoir cap will likely become splattered with the milky oil. This happens when coolant comes in contact with and contaminates the oil.

### Bubbling Inside Radiator

If you notice bubbling inside the radiator or coolant reservoir, it’s an indication your system has air in it, which could be caused by a leaking or blown head gasket.

### Fouled or Wet Spark Plugs

If the gasket is blown, it’s possible for coolant, oil, or gas to get into the cylinders. This could foul or flood the spark plugs.

![This is not a service you can ignore.](<https://www.thedrive.com/wp-content/uploads/content-b/message-editor/1605546942361-depositphotos_101798962_xl-2015.jpg>)
*This is not a service you can ignore., *Depositphotos**

## Pro Tips To Fix A Blown Head Gasket

Like the Wu-Tang Clan, blown head gaskets ain’t nothin’ to mess with. *The Drive’s* researchers have come up with a few tips to help you avoid catastrophic engine failure.

- Unless you’re an experienced home mechanic, you’ll want to flat-tow the car to a shop.
- Some of the symptoms of a blown head gasket are similar to the symptoms of other engine problems. That can make it hard to identify the problem, but a good rule of thumb is to get the car to a mechanic as soon as possible.
- Products like head gasket sealer can help you limp the car to a mechanic, but don’t treat them like a fix.

## Get Help With Blown Head Gaskets From a Mechanic On JustAnswer

*The Drive* recognizes that while our guides are detailed and easily followed, a rusty bolt, an engine component not in the correct position, or oil leaking everywhere can derail a project. That’s why we’ve partnered with JustAnswer, which connects you to certified mechanics around the globe, to get you through even the toughest jobs.

So if you have a question or are stuck, [click here](<https://trk.justanswer.com/aff_c?offer_id=2&aff_id=10869&url_id=10>) and talk to a mechanic near you.

## FAQs About Head Gaskets and Head Gasket Repair

You’ve got questions, *The Drive* has answers!

## Featured Products

[Bar’s Leaks 1100 Head Gasket Repair](<https://www.amazon.com/Bars-Leaks-1100-Gasket-Repair/dp/B000OO04MQ/?tag=drive09e6-20>)

[Blue Devil Pour-N-Go Head Gasket Sealer](<https://www.amazon.com/BlueDevil-Pour-N-Go-Head-Gasket-Sealer/dp/B004500M8G/?tag=drive09e6-20>)

[Big Red Torin Steel Jack Stands](<https://www.amazon.com/gp/product/B000CODPF6/?tag=drive09e6-20>)

*Got a question? Got a pro tip? Send us a note:* [*guidesandgear@thedrive.com*](<mailto:guidesandgear@thedrive.com>)

## Author
After working in the technology and software industry for several years, Chris Teague began writing as a way to help people outside of that world understand the sometimes very technical work that goes on behind the scenes. With a lifelong love of all things automotive, he turned his attention to writing new vehicle reviews, detailing industry trends, and breaking news. Along the way, he earned an MBA with a focus on data analysis that has helped him gain a strong understanding of why the auto industry’s biggest companies make the decisions they do.

### Author social links  
[Instagram](<https://instagram.com/TeagueDrives>)  
[Twitter](<https://twitter.com/TeagueDrives>)