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<p>[QUOTE=&quot;WeirdFishes, post: 1794631, member: 41261&quot;]Quick side note. The plastic end tanks on either side of my truck&#039;s radiator started leaking last week forcing me to replace it. Weird. I digress.</p><p>&nbsp;</p><p>I apologize for not following up with more information (its kinda technical and doesnt make for the greatest read) on the concepts of pressure, vacuum, air tight and water tight. To imrich it sounds like you may have a different primary language so hopefully what I am putting down you can pick up. First, you are correct about the use of plastic side tanks on car radiators, a practice begun for, what else, to cut costs. So you are right that metal and some type of plastic can be bonded to one another in such a manner that the points of contact would not leak under pressure... BUT you and I are talking about two different things. Yes if you drive your car around for awhile and (DONT DO IT!) decide for some reason to take the cap off of your radiator while the engine is still hot... you will be greeted with a trip to the burn ward. So while there is most certainly pressure inside the radiator you must remember antifreeze (glycol) circulates by means of a water pump. This is a dead give away that a vehicles coolant system operates at relatively low pressures. If I emptied the system, plugged the opening and the drain and added compressed air up to 500psig, would the radiator leak? If I pulled a vacuum on the radiator, a deep vaccum between 200-500 microns, would the radiator pass a standing vacuum test? It sounds like you have at least thought about this whole issue and that you may perhaps be aware of different methods and materials than myself so I would be curious to hear your response. Thx[/QUOTE]</p><p><br /></p>

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