Cadillac DTS Forum - 2006 through 2012 Discussion, want to flush Dexcoool coolant in Past Cadillac Vehicle Discussion; I have two GM vehicles both in warranty and am thinking about flushing the pink Dexcool coolant out and replacing ...
I have two GM vehicles both in warranty and am thinking about flushing the pink Dexcool coolant out and replacing with green antifreeze post haste. Just read about the class action lawsuit against GM earlier this year. GM introduced this pink stuff in 1996 and I have been hearing since 2002 about how it mucks up radiators, and damages gaskets/ seals.
I have heard two solutions. Flush it out, and replace with the good old green antifreeze, or at least change the Dexcool every two years (as per a radiator repair website) which is a far cry from the 100K service the manual says you should get from this stuff.
The question is, would replacing coolant with something other than Dexcool potentially void the factory warranty for any reason?
Just got an answer to my question. Flush and replace Dexcool with Dexcool every 30-40K miles per my non-dealer service guys I have used for 20 years. A few years ago the word was to flush out the pink and replace with the green but there are corrosion issues that have ben determined to develop when replacing green into systems that had the pink.
After four years the Dexcool in my wife's DTS was fine and caused no problems. I also had Dexcool in my 2004 and 2005 CTS-Vs with no problems. My 2009 CTS-V has had Dexcool in it for almost a year with no problems. In short, I have had no problems with Dexcool.
All of the documentation that I have now or have had for Dexcool indicated that Dexcool is good for five years or 150,000 miles. This includes all owner's manuals for vehicles containing Dexcool and both Texaco and Shell versions of Dexcool. In my case, I have never kept a car with Dexcool for five years or run it for 150,000 miles (Superjim drives a lot!). So, all of my vehicles had the original Dexcool coolant in them when they went away.
There is no proof given in the previous post that the gasket failure was due to Dexcool. Since there was no original or extended warranty available to cover the cost, whoever fixed the problem might say anything.
As other posters have noted, mixing Dexcool with other types of antifreeze is totally unacceptable. This fact is noted in the owner's manuals and on the antifreeze containers of all Dexcool brands. If gasket are not destroyed, the resulting sludge will definitely clog up the cooling system.
A shop vac, or compressed air, might get a little more out, but it's really not necessary. The only way to COMPLETELY drain the system, is to remove the coolant crossover.
On the topic of DEX-COOL and mixing it with green coolant:
There is absolutely NOTHING different about the aluminum, plastic, rubber, and steel components of the cooling systems or engines in GM cars, or GM gasket materials, than any other manufacturer. There is absolutely NO reason that you NEED to use DEX-COOL. Any coolant labeled for all makes/all models will do EXACTLY the same thing, and WILL NOT damage anything.
DEX was intended to be a long life, silicate free coolant, that's all. There's nothing particularly special about it. Compare the ingredients on a bottle of DEX, to those on a bottle of "the green stuff".
Mixing DEX with any green coolant that states it is mixable with any color coolant, WILL NOT damage anything, WILL NOT eat away at gaskets, and WILL NOT create any magical, evil "sludge".
When I bought my 2006 DTS this Summer ,one of the first things I did was take it to the dealer and had transmission service and Dexcool complete change. It was neat they just hook up a machine and does complete change.
Looking at changing my coolant. Is there a drain somewhere?? I could disconnect the lower hose where it attaches to the engine, but can't see how I could reach the lower hose where it attaches to the radiator.