In an engine this suppresses spot boiling in the hottest parts of the engine, namely the cylinder head or heads, as well as suppresses harmful cavitation (low pressure-induced boiling) at the water pump. This raises the boiling point of the coolant the same way a pressure cooker raises the boiling point of the cooking water to cook food faster. ![]() And when those surprises crop up, many folks will be climbing the walls looking for the cause because they believed that they credibly tested the new part, and since it passed the old bearded guy’s test, the problem must be somewhere else.Ĭoolant tank pressure caps as well as radiator caps of the last 40 years or so provide two separate and critical functions: one is to contain the pressure within the cooling system created by expansion of the coolant as its temp increases. ![]() Well he’s right on the latter part but the video is highly misleading because what is shown is in no way a functional test of one of these caps, and if you put your trust in such a test you may be in for some surprises. Some of these folks are undoubtedly referring to a short, funny little video that’s made the rounds, where an older bearded dude sucked and blew thru a cap’s outlet nipple and declared one of the caps was good because he couldn’t suck air out the nipple and it made a rough kazoo kind of sound when he blew in, where the other one flowed air freely in both directions, so it was junk. as confirmation that their new cap is OK. In online discussions about replacement coolant pressure caps for Vanagons, people often talk about blowing, quacking, making kazoo sounds, etc.
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