Understanding Heat TabsImportant Heat Tab Information: Tech Notes


Important Heat Tab Information

Heat Tabs are installed on engines to detect abnormally high engine coolant temperature. The Heat Tabs are placed on the cylinder head(s) and on the engine block in an area that is in direct contact with the engine coolant. They can be found mounted on the casting surface or inside of a freeze plug.

If the engines operating temperature reaches or exceeds 250° F the center of the Heat Tab will melt and flow out. This is a positive and certified method of determining whether the engine has reached a temperature beyond the normal operating range, thus voiding the warranty.

The warranty is also void if the heat tab shows any signs of being tampered with or is removed from the engine. 

Failure of an engine from the effects of overheating is not covered under the limited warranty.


Download these tips and additional information about heat tabs.

More Information

For more information, contact  fleet@holmanparts.com