I drill a 1mm hole in my thermostats also if I do not get one with a jiggle valve. Jiggly make happy.
Quote:
Originally Posted by Rupert944
I was thinking of buying a pressure tester kit for this approximate purpose, but I found that a valve stem will fit in overflow hose. I haven't got it leak free, but it seems like it holds 10 psi well enough. Haven't had a chance to try it yet. I just cut a presta valve off an old bike tube.
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How do you seal the reservoir neck? Isn't the overflow only in play if the cooling system cap seal is lifted off it's seat?