08-05-2004, 06:06 PM
do test the PH like RJ sugested, although I understand you can test with a multimeter too. I could look up how to do that if you can't find it somewhere. The coolant does lose its anti-corosion properties after a while, and surprise, water and iron make rust. It also produces a current while it's doing it, that's why it can be detected with a multimeter.