Yep, trust me. I know what I'm talking about with a block tester. I actually did it the first time I used it, I got a false negative reading. Actually the very FIRST time I used it years ago I sucked coolant from the full overflow bottle into the tester. Thats why they have a fill line, so you can see if you sucked in coolant or not. Then the second time with an empty overflow but overflow hose still connected, I got the false negative because I was sucking air in from the empty overflow bottle. Then I realized I had to plug up the nipple with a friends finger lol and then I got my dreaded green test fluid. Yellow is like omg your head gasket is gone, green is like, its on its way!!!
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