Easy way to check for radiator corrosion protection, just as important as checking the antifreeze, if the coolant is allowed to become "acidic" the engine and radiator will also become corroded with rust. Using a volt-ohm meter (VOM) set it to a DC voltage range that measure in "tenths" of a volt, remove the cap and place the negative VOM lead into coolant, being very careful not to touch any other part of the radiator. Place the Positive lead of the VOM against a bare metal part of the radiator (or a good ground of the engine), a reading of 0.2 volts or less, coolant is in good shape, a reading of 0.5 volts it is borderline, 0.7 volts replace your coolant immediatly. This comes from my "Model A" workshop manual and also says it works in modern cars as well, which is really more important because of aluminum heads or dissimilar metals in modern cars. _______________________________________________
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