TwinTurbo.NET: Nissan 300ZX forum - I've found this in Old Cars with Dirty Coolant Passage Ways
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Subject I've found this in Old Cars with Dirty Coolant Passage Ways
     
Posted by Cjw3 on June 06, 2019 at 9:47 PM
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In Reply To Irregular overheating issue + coolant leak posted by Zashi on June 06, 2019 at 06:32 PM
     
Message If you have Rust Scum built up on the Cylinder passageways, the Steel underneath the Goo can be hotter than boiling, but the coolant is circulating pulling the heat away..

When the Engine Stops, the Coolant Stops Circulating.. the localized Area ( Hot Spot ) now does not have Circulation to remove the heat and the Water Boils in that location.. Burping out the Coolant..

GOOD Engine Flush should fix it if that is the problem..

Cj

     
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