Re: Cooling System Questions

Posted by Mr.Pushbutton  On 2008/4/10 20:30:23

For flushing the block I like to use Borden's #7 flush--I don't know if they make it any more. It was a two-part podwer that you added to a dry system, top off with water and run the engine till it's good and hot, then drain, add the neutralizer, fill back up (wait a while so you don't crack anything) then run that through and dump it.
For old cars I still like a 50/50 mix of good quality green antifreeze and water. That is proven to give the best transfer heat to the radiator. The orange stuff is Dex cool and it is for engines where iron and aluminum are mated together. I wouldn't want any antifreeze in an old car for more than 5 years, a new car can get 100,000 miles in 4-5 years (and still be pretty tight!), a Packard might take two generations to rack up those kind of miles.
Too bad you didn't flush the engine while you had the dirty old radiator--if you do it after you put the cleaned up core back in you might risk mucking it up.
There are methods where you just feed a garden hose and let it dump out.