Quote:
Originally Posted by Jhill
Wouldn't be from over pressure as that would just make the cap open and dump into the reservoir. Looking like more possibly a porous aluminum pipe. I would first recommend using a cooling system pressure tester and leave it overnight (after cleaning the area of course). Then see if you find and traces/wetness around the pipe, flags area etc. it may not show as it may only be happening when hot and the aluminum spreads out. If that is the case they have dye you can put into the cooling system and then check with a black light to find the source. Might even just be a bad hose clamp and wicking onto the pipe, fluids can do some weird stuff sometimes.
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Thanks for the input. You may be right about the aluminum spreading or a bad hose clamp. Thanks for the recommendations for testing.
The thing I find interesting is that if coolant is leaking / spitting from between the cap's rubber gasket and the aluminum sealing surface that it is pressing against, I would expect to see some remnant of coolant at least somewhere on the gasket-side surface of the cap that is directly adjacent to the gasket.
But, as you can see on the photo of that gasket-side area, there is none, even on the downward-pointing edge of the cap or any of the aluminum just outside of the convex sealing surface, which is weird. I should have noticed whether this was also the case on the original cap, but, once again, I, as well as the tech who did the pre-purchase inspection, may have made a mistake in assuming that it was the cap that was leaking.
Thanks again.