Join Date: Aug 2009
Location: Washington, the state
To check the corrosion inhibitors, when you have the plastic off and can get to the radiator cap, try this---
--With the engine cool, open the radiator cap and put one probe of a digital voltmeter into the coolant, not touching metal. Put the other probe on the battery negative post. If you read 0.1 volts DC to 0.3VDC, you're good. If you get 0.5VDC or more, the corrosion inhibitors are depleted and you're overdue for a flush and new coolant.
I've never been able to completely drain any engine I've worked on. If I flush with water, I replace half the book capacity with full strength antifreeze and top off with water. If your tap water has low mineral content, then tap water is OK. If it has high mineral content, then using distilled water is wise.
"Older people who are reasonable, good-tempered, and gracious will bear aging well. Those who are mean-spirited and irritable will be unhappy at every period of their lives.
"Let each of use properly whatever strengths he has and strive to use them well. If he does this, he will never find himself lacking."
Marcus Tullius Cicero