You have just brought back an old memory. I had a stuck closed thermostat on a Morris 1000 van. It had been left standing for along time and I think corrosion got to it. It would be fine for 30 minutes driving and then the temperature would start to climb. It would then start to eject the coolant and there was plenty of steam to attract your attention to a problem. After pulling over and letting it cool I was able to remove the radiator cap. (Glad I used a big rag) I added water and made it home ok. I thought there was maybe an airlock that had caused the overheat and coolant loss. When it happened again the following day I knew there was a problem and eventually found the thermostat seized. Fitted a new one and never had a problem afterwards.
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