[‚thər·məl ′sōk‚bak] (engineering) A phenomenon whereby, due to the lag in propagation of temperature changes through insulating materials, the maximum temperature of a thermally protected structure may be reached a certain time after the protective coating has reached its maximum temperature.

What is Heatsoak?

The term, “heat soak” refers to a raise in the engine coolant system temperature and pressure after the engine is turned off.

What causes Heatsoak?

Heat soak is caused when hot components i.e. exhaust, turbo charger contribute to increasing the overall engine temperature and can have a critical affect on the engine particularly when the engine has been running and is then switched off.