Taken from The Family Handyman
Electrolysis and your antifreeze coolant:
If you think the only job of antifreeze (coolant) is to cool the engine during the summer and prevent freeze-up
during the winter, read on. Coolant also plays an important role in preventing corrosion caused by electrolysis. Electrolysis occurs when two dissimilar metals start swapping electrons, causing the metals to corrode. Since an engine has aluminum, copper, cast iron, steel and magnesium alloys, electrolysis will slowly eat away at its innards.
Antifreeze (coolant) has additives to prevent all of that electron swapping. But, as coolant ages, the additives are
depleted and can’t do the job anymore. In fact, worn coolant becomes a pretty darn good electrical conductor,
accelerating internal electrolysis. The good news is that it’s pretty easy to check the conductivity of your coolant with a digital multi-meter. If the conductivity is high, its time for a coolant flush and fill. Here’s a quick way to check it.
Begin with a cold engine. Remove the radiator cap and start the engine. Set your digital multi-meter to DC
volts at 20 volts or less. When it reaches operating temperature, insert the positive probe directly into the coolant. Rev the engine to 2,000 rpm and place the negative probe on the negative battery terminal. If the digital meter reads .4 volts or less, your coolant is in good condition. If it’s greater than .4 volts, the electrolysis additives are exhausted, and you may be in the market for a new radiator, a water pump or a heater core in the future. All of those are far more expensive than a simple coolant change.