I ran right down and did mine last night. 1.5 volts. One less thing to
do this winter:) Thanks Fred
John Mitchell
FRED E THOMAS wrote:
> 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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