Well, the bulb tester just measures liquid density and all it tells you is the freezing and boiling points of the solution or how much antifreeze you have in relation to water. It tells you nothing about corrosion protection. So use it to verify your water/antifreeze mix is right, but nothing else.
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Originally Posted by okc329
I used the tester on my coolant and got a reading of - 40+ degrees
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I don't understand. Is that -40 or +40? Fahrenheit I assume?
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2004 VW Jetta TDI (manual)
Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL
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