Question about 1999 Chevrolet Lumina

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Re: Dex-Cool in 1999 Lumina

Thank you very much--I appreciate your input, and have added the Dex-Cool.

As a point of interest, I subsequently ran across an article that seems to suggest a different view:

"7. Mixing a “green” coolant with DEX-COOL reduces the batch’s change interval to 2 years or 30,000 miles, but will otherwise cause no damage to the engine. In order to change back to DEX-COOL however, the cooling system must first be thoroughly drained and flushed."

The article was summarizing a report given at the MACS 2001 Convention and Trade Show in Orlando by GM’s Jay Dankovich and Equilon Enterprises’ (Texaco) Stede Granger who had directed a 2-year study of thousands of DEX-COOL cooled vehicles.
http://www.imcool.com/articles/antifreeze-coolant/dexcool-macs2001.php

They seem to say that the only negative result of mixing a non-Dex-Cool with the Dex-Cool is that the "change interval" is reduced from 150,000 miles to 30,000 miles--otherwise no damage results.

Any additional/other thoughts on this?

Thanks again.

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  • luminex Mar 12, 2009

    Very thorough and thoughtful input, Guru. Thank you so much for your reply.

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  • Chevrolet Master
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The major reason for using dex-cool is that antifreeze is often neglected as a service item. If neglected, it becomes acidic over time which is particularly important with the use of aluminium in most major components which are served by antifreeze. Acid causes etching and premature failure of gaskets and permanent damage to blocks, heads and especially the radiator and heater core, which are not vert thick to begin with.
Since "normal" antifreeze acidifies faster than does dex-cool, mixing both together causes a change in breakdown rate...the more "normal" coolant added, the faster it breaks down.
Both coolants do not react chemically with each other and therefore retain the same ability to prevent boil over and freezing.
In reality, normal coolant can be used with little or no effect on components, provided that you change it every year. (that's where the EPA gets involved) They do not want people dumping this stuff into the ground, so they push for extended service intervals. Since dex cool has a longer service life, that's what they want you to use.
As far as how you chasnge the coolant, it is always a good idea to flush system during a change, regardless of antifreeze type. This removes solid particles which can plug radiator core. Radiators are much smaller than their older counterparts. Loss of even a small portion of cooling area can cause overheating. Engine running temps are also higher than older vehicles (heat=power output). Therefore most systems have a much smaller margin of error than before. What I find though is that regular flushing can also be bad for the system as the chems eat away at metal components in order to clean. I recommend regualr or dex cool antifreeze systems be flushed with water only, once a year, but retaining what you removed and filtering it through a coffee filter, using it during the year to "top off" the system. To retain effectiveness of coolant, use a hydrometer to check concentration, adding new coolant to bring reading to proper protection level.Then, every three years, do a complete chem flush and change entire batch. This keeps your system clean and the epa happy!

Posted on Mar 12, 2009

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How do you bleed the air from the cooling system of a 1999 v6 pontiac grand am


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