does anyone know the ratio of dexcool to add to the raditor if it is completly flushed?

 

none dexcool if not kept in an ideal situation forms acids that attack every part if the cooling system.

 

http://www.startribune.com/stories/435/21199.html

 

that article does not mention the cause of the low coolant level on those vehicles which usually turns out to be a radiator cap that stuck slightly openallowing small amounts of hot coolant out to evaporate and then sucking in air when the system cooled.

 

i'll be sure to switch back to prestone next time i plan to go two years or so without checking my coolant...

and 50/50 is usually the optimal mix for either type of coolant

 

hey
your like a month late...where were you...lol

 

Here is some firsthand info. I have 4 GM vehicles running DC, one the 89 rock was converted the other 3 factory fills. After 40k miles or so none of the 3 factory fills had any problem until the one Blazer developed a leaky water pump. It had run that way for a little while until I picked up the leak(wifes car, lucky it has gas half the time). It developed a brown fine coating in the rad similiar to rust that seemed to attach itself. I flushed the system and it seems OK now. One of my friends works for a local municipality with a fleet of GM cars running Dexcool. He seems to say about the same thing, if the cooling system is well maintained DC is a good coolant. However if a problem occurs or the system is run low DC will develop this brown appearance. I converted the Camaro right after DC became readily available and it has been fine for years. I did completely drain the block and replace all the rubber components when I converted and it looks just like when I put it in. My friends at the local GM dealer are evenly split on this subject so who knows.

 

Dex Cool has a chemical base that acts as a passivation of the internal metal parts, which creates a corrosion resistant coating. This is why the Dex Cool lasts longer than normal "green" coolant. I believe it is also silica free.