Quote:
Originally Posted by dmsfrr
When you shut the engine off the coolant is no longer being circulated by the water pump and cooled by air flow thru the radiator. So it just sits there being really warm until it cools down on its own.
If it isn't 'boiling over' and spitting coolant out the overflow tube at the radiator cap it should be fine.
What is the pressure rating on the radiator cap? Something under 15 ???
I'll bet it's a very common situation but isn't noticed on most cars because the Temp gauge is electric and turns off with the key when the engine is turned off.
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Very true what you said. I have heard this condition called "heat soak" and "latent heat of absorption". Not hard to understand that when temps in combustion chamber reaches a couple thousand degrees (I have been told that) and when coolant stops flowing the engine temp will rise. Does the inside of a combustion chamber really get that hot??