Ask an expert
![Anon](/assets/aa/aa-avatar.png?m=1466990309)
What cause's a motor to overheat and the cylinder head to crack.
George
From the "Ask Jack" archives - 28 August 2009
![jbiddle](themes/aaAle/images/interface/profile-pic-placeholder.47cf740a.png)
There is no one single answer to your question.
Overheating can be caused by a number of issues such as, but not exclusive to, blocked radiator, sudden or gradual loss of water, faulty water pump, faulty thermostat, faulty radiator fan, towing, extremely lean fuel /air mixture to name a few.
One thing is certain however, an overheated engine and damaged cylinder head is a result of a overheating problem not the a cause.
Some vehicles have unique issues as well. For example, some Subaru's with a modified and non genuine air intake system or element, can develop overheating problems which can cause major internal engine damage.