Originally Posted by andrewwynn

The UV will help find the leak. Both times mine and wife's expansion tank leaked it was so subtle at first never saw a drop just magically low on coolant.

The crack on wife's was not on a seam, but on the rounded corner. Absolutely invisible crack until I filled to top and the car was still over 212/100 and boiled created pressure and a 5mm stream poured out of the now barely visible hairline crack.

Put some paper towel around the reservoir and drive until you get full temp you should get enough pressure to make the paper damp and show a little color.


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