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Sorry,im just having a laugh mate, to be honest the silica bags aren't hugely common, ive seen only 2 where they had contaminated the system, and was a major PITA to get that out of the system,both cars lost there heaters,VW sell a special cleaner specifically for that issue and it worked very...

:haha: I knew you'd gone to google it as it took you so long to reply

So when a silicone pouch that's fitted inside the VW/Audi expansion tanks ruptures...as they do, how does it end up blocking the matrix? which they do.

How could it possibly empty when there's a coolant return line in the same tank?? whatever gets taken from the tank is put back in through the return line whether its from circulation or expansion, my advice was sound and included minimal risk of contaminating the rest of the system, don't see...

If its ran from cold it can and will draw coolant from the coolant tank, as it circulates around the WHOLE system, the coolant in the header tank doesn't just sit there getting stagnant!

If it hasn't been ran just clean out the header tank (remove it if necessary), if its been ran then you can buy coolant system cleaner/degreaser from places like euro car parts, specifically designed for situations where engines have had oil cooler failures or silicone pouch's burst etc