"Even though I had previously changed the cap for a new one supplied by the PO, I changed it again for one purchased through B and G and voila, coolant loss problem resolved."


That sentence reveals the simple truth that all pressure caps are NOT equal. Sadly there are a lot of fake or inferior products posing as quality. I have been caught out by them in the past.

I noticed that all the mobile mechanics have a pressure testing kit and got myself one. It quickly became clear that only trusted suppliers could be relied on to provide the genuine article!
Remember, if it is cheap, it's probably fake!

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