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Anyways, I'll just post text and not a video. I bought the Harbor Freight Cooling Pressure Tester and the black adapter fit perfect. Pressurized to 12 psi (same as stock overflow cap psi) and it held. The video I took of it holding 12 psi steady for a minute. I even took off the oil cap just to make sure I wasn't sealing it. Same same, no leaking and had it hold for 10 more minutes.
I am thinking the PO put oil in the overflow tank and at the same time the overflow cap is bad. Your thoughts? |
I'd go with the accidental contam theory, and perform the multi flush and distilled water test. It's the cheapest and easiest way to start, and you might resolve the problem for the cost of a few gallons of distilled water. Kroger sells it cheap.
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It's just the process I was thinking. Also, since this is the first mid engine I ever worked on, is there a bottom hose on the radiator? I am assuming in front of the car? Please disregard the noobness in my questions. :) |
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There is a drain plug in the bottom. As i recall its an 8 or 10 mm allen screw. Looks like a little round metal button on the aluminum tube manifold under and in front of the engine. Using detergent will greatly increase the cleaning, but it can also foam. I'm not sure how that behaves in a water pump. You'll want to make sure there is no detergent left in the cooling system when you are done if you go that route. If you do use detergent please take photos and let us know how it goes.
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Pretty sure I've seen it mentioned here, to NOT use any detergents in the flush. (maybe search) There are tons of nooks and crannies in these systems, and seems the best advice is to use simple distilled water. Also, unless you vacuum fill the system, you need to know the bleeding/burping procedure to get all the air bubbles out of the system.
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Just curious and still learning. Although I did the cooling system leak test, exactly what does it diagnose on our cars? I know the obvious like a leaking overflow tank, hoses, but what else does it diagnose?
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I did that with mine shortly after purchasing. Your coolant cap isn't sealing properly and when the coolant gets hot it overflows and drains through that little hose to the ground.
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Ok, did a single flush, put about a cup of simple green in the overflow, mostly to break down the oil in there. Also, did the oil change and filter/cover, thermostat/housing, cabin filter and new spark plugs. Still got some gunk in the coolant but I'll do another flush later.
You can see a lot of oil gunk pieces floating around when I drained it. You can see how bad the gunk was in the old thermostat. Also noticed no washing of any of the spark plugs, which is a good thing. Spent about an hour zipping around my neighborhood and one the main roads I was able to punch it. Got up to 60 real fast, these little cars are peppy and the handling is pretty awesome. The night was about 65 degrees but the Boxster never got above 180 during the test run. http://986forum.com/forums/uploads02...1526183836.jpg http://986forum.com/forums/uploads02...1526183861.jpg http://986forum.com/forums/uploads02...1526183886.jpg http://986forum.com/forums/uploads02...1526183923.jpg http://986forum.com/forums/uploads02...1526183955.jpg http://986forum.com/forums/uploads02...1526183976.jpg http://986forum.com/forums/uploads02...1526183997.jpg |
Keep flushing! Certainly worth a shot. Sure hope it works for you.
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