Rusty coolant and radiator flush
 

I had some really nast brown coolant in the radiator when I pulled my motor, enough to plug up the petcock when I tried to drain it.

Anyway its obviouse I will be flushing the system but I want some opinions on if I should use a flush cleaner.

Read about a wide range of different things to try:
Coke
Viniger
Preston super radiator cleaner
GM P/N 123465000 2 part cleaner
Lestoil
Oxalic acid + Neutralizer
Dupont 2 part flush.
spic and span
Permetex 80030 HD Radiator Cleaner

Looking for some feed back. I don't want to create a new problem.

Preston super radiator cleaner
Dupont 2 part flush.
GM P/N 123465000 2 part cleaner

Those should work ok but.... I'd take it to a radiator shop and have them boil/flush it out if it's that bad. They will get it clean and serviceable again. And they'll let you know if it's still good to use.

I 'm surprised nobody mentioned drano. It will cleane out your cooling system all right but you absolutely must flush it completely afterwards, and plane on replacing the water pump.

Drano, that's a new one to add to the list. The issue I have with the "experimental" treatments is no one really know what it will do to the gaskets or water pump seals.

I pulled the pipe plugs on the block last night and drained the remaining coolant. I guess it wasn't as bad as I thought. Still a bit brown and cloudy but not like it was all sludge. I could still make out the green in the coolant. I think I will go with the two part cleaner and flush it out when I get it back together.

I just cleaned out the system in my TA the other day. I put in about 16 oz of dishwashing detergent and let it run with that for a little while, then drained it out. It has no more brown rust in the coolant system.

LOL.... Is it still blowing bubbles? ;) That's one I've never heard of.. glad it worked ok.

its not experimental and it works. its extream but it works

I read that there are acid cleaners and detergent cleaners. I want to use an acid cleaner as I think my cooling system needs it.

I'm kind of leaning to the Vinegar solution now. There is a tone of info on it. Seem pretty strait forward. Has anyone tried this. I'm not seeing a downside yet.

I have used Rydlyme in the past with good success. Bio-degradeable and does not seem to harm seals.