Question about 1999 Chevrolet 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.
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?
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
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Dec 31, 2015 | Pontiac Cars & Trucks
Aug 04, 2015 | Chevrolet Chevy Cars & Trucks
May 10, 2014 | Cars & Trucks
Aug 22, 2012 | 2003 Chevrolet Impala
Oct 27, 2011 | 1999 Chevrolet Lumina
Dec 28, 2010 | 1999 Oldsmobile Intrigue
Nov 17, 2010 | 1999 Chevrolet Lumina
Oct 03, 2010 | 1996 Chevrolet Lumina Mini
Dec 17, 2008 | 1999 Chevrolet Lumina
338 people viewed this question
Usually answered in minutes!