I don't know what to do... I got a new temp sensor from fastlane this morning. I installed it and at first it didn't seem like the temp gauge was working but after about 10-15 mins it finally starting creeping up to 50c. I was at a red light and a guy next to me was screaming that my car was spewing antifreeze. I pulled over and opened the hood and there was antifreeze everywhere!

There are only 2 ways I see this. Either I left the expansion tank cap loose or the temp sensor is completely wrong and my car overheated.

Are the caps designed to loosen if the car over heats? The cap was loose when I first pulled over.

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1984 300td euro turbo