Quote:
Originally Posted by cabmando
Nope! I refuse to learn from the mistakes made by others! I must make the same mistake. 
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This has long been my approach, and I also consult repair manuals only when I ran into problems. Then, a few years ago, I started doing the research BEFORE doing the work. This new method works exactly like the old method did, except that the work has become faster, easier and less expensive.
Another policy of mine is to try to out-think the Porsche design engineers almost never. On the topic of windshield washer check valves, I assumed the engineers had reasons for using the parts they did. And I just got a whole new system except for the tank and pump. New hoses, fittings, squirters, etc. It is likely I avoided some aggravation this way. And finally, I notice the check valves are not designed and built to NASA specifications. They're pretty simple and depend on plastic parts mating together perfectly, which may not always happen. Also, vehicles vibrate and shake, and change temperatures. In theory, one check valve should be sufficient. In the real world (where I live), maybe not.