Quote:
Originally Posted by Bruce Lancaster
bobH is probably correct, though there is also the possibility that they got the block REALLYDAMNCLEAN and it went to hell in a big hurry running without the antifreeze!
"chemical cleaning process (which some of us are a little afraid of)" YES! In this case, chemical cleaning is the only hope without tearing a running car apart, and the Evaporust is the only chemical I know of that is really effective at rust eating and not capable of eating iron and/or whatever it encounters in the radiator. If this is to work, it will need a lot of chemical in there for a substantial amount of time, and most alternatives are acid or caustic and will eventually eat anything they can find, like the fox sent to get rid of the mice in the chicken coop...
Evapo will be safe.
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I like the looks and sounds of the Evapo-Rust. I'd not heard of it before and just read up all about it. I wanted to make sure that it was safe for engine blocks. Sure enough. It removes the rust by a chelation process rather than acid which is much safer for the underlying steel and all other metals. Here are the instructions on the web site for cooling systems. Looks like it shouldn't take more than overnight.
1. Drain cooling system and rinse with water.
2. Fill system with Evapo-Rust®. (Do NOT dilute.)
3. Run Engine under normal conditions, shut engine down and let sit, for a couple hours to overnight.
4. Drain system into a container for later use.
5. Flush system with water.
6. Repeat process (1-5) if necessary.
7. Fill system with proper coolant/antifreeze.
I've got my two test chemicals now. I'm going to soak one pump in vinegar and the other in Evapo-Rust and photograph them each day to see what happens and report.
Thanks for your ideas. Hope one of them work.