Originally Posted by djb383

One would think the FSM would have a warning about driving in those scenarios with a rad that has plastic tanks. LOL

Originally Posted by BlueRidgeMark

You might be suffering from galvanic corrosion, which is often mistakenly called electrolysis.

...

Here's how to tell if this is your problem:

Get your voltmeter out, set the scale to the lowest DC measurement. Put one end in the coolant at your fill cap, and connect the other end to a clean spot on your battery negative (ground) terminal. Go straight to the battery terminal, not some other place on the body.

In a perfect world, you should see ZERO volts. If you see even a few tenths of a volt, you have a problem, and you need to fix it before you drop any more money on new radiators.

Originally Posted by chief turbo

Thanks! will try this!