01/09/2026
Why this Astra overheated: Brittle plastic disaster 💥
Ever wondered why cooling system leaks happen out of nowhere?
Pulled off this Holden Astra thermostat housing to find the internal plastic channel completely broken away. With nothing supporting the rubber gasket, it deformed under heat and pressure, causing a major coolant leak and severe overheating.
Fresh housing assembly installed, cooling system bled, and running at the correct operating temperatures once again.
Don't ignore minor coolant smells before brittle plastic leaves you stranded! 🔧