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#2575929 - 03/22/12 10:11 AM GM Dex-Cool, 134K miles, 04 Chevy Tahoe
dhellman12 Offline


Registered: 08/29/11
Posts: 218
Loc: Keller, TX
This was the other 2004 coolant sample that I submitted. According to the little prestone tester, this fluid was in better shape than the diesel pickup (5 of 5 balls floating). Obviously there is a lot missing from the hand held tests.

Will be replacing the fluid this weekend with either Valvoline Maxlife or Amsoil coolant.

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#2575946 - 03/22/12 10:19 AM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12]
Rand Offline


Registered: 08/20/03
Posts: 11286
Loc: NE,Ohio
the balls tell you antifreeze concentration.. nothing about actual condition..

usually with those style testers 1 is weak 2-- is kinda week

3-4 good.. 5= too much antifreeze not enough water.



I'd say the coolant is worn out and needs replaced asap.


Edited by Rand (03/22/12 10:21 AM)
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#2575959 - 03/22/12 10:34 AM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12]
bullwinkle Offline


Registered: 10/09/04
Posts: 6302
Loc: Cincinnati, OH, USA
I'd also suggest sticking with distilled (cheap at WM) water or reverse osmosis filtered water to get the minerals out. Wonder how the concentration got so high? Topping off with straight Dex only?
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#2575966 - 03/22/12 10:43 AM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 18105
Loc: Sunny Florida
Why change coolant?

There's absolutely nothing wrong with Dexcool in a properly set up and maintained system.
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#2583490 - 03/29/12 11:20 AM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: SteveSRT8]
Loobed Offline


Registered: 07/20/07
Posts: 3742
Loc: Northern California, USA
Originally Posted By: SteveSRT8
Why change coolant?

There's absolutely nothing wrong with Dexcool in a properly set up and maintained system.


Dexcool is suppose to be changed every 5 years or 150k miles.


P.S. Where did the copper come from?




Edited by Loobed (03/29/12 11:21 AM)
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#2583639 - 03/29/12 01:59 PM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 18105
Loc: Sunny Florida
well it sure didn't come out of an all aluminum and plastic radiator!

We run dex in factory filled fleet vehicles to component failure, and it's almost always more than 150k miles.

Never a problem. EVER.

Dex used to have issues but it flat out does not anymore. Even Ford is using it now.
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#2583755 - 03/29/12 03:27 PM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12]
dhellman12 Offline


Registered: 08/29/11
Posts: 218
Loc: Keller, TX
Went back with the Amsoil antifreeze (& Wally distilled water) in this one. Cost was $8 higher and it's supposed to last for 7yrs or 250k miles. If nothing else will be good to compare that to the factory fill of Dex cool.

Agreed on the Dex coolant, both of my vehicles are 2004 and were running factory fill. The Tahoe showed it needs to be changed, the Duramax was still good (@ 8yrs & 117K miles). Don't think there is anything wrong with Dex Cool, just thought I'd try something else and see how it performs.
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#2588883 - 04/03/12 08:19 PM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: SteveSRT8]
PandaBear Offline


Registered: 08/05/02
Posts: 13448
Loc: Silicon Valley
Originally Posted By: SteveSRT8
Dex used to have issues but it flat out does not anymore. Even Ford is using it now.


Did they reformulate it? or did the cooling system design change?
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#2591439 - 04/06/12 04:37 AM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12]
RoGuE Offline


Registered: 02/05/08
Posts: 595
Loc: Atlanta, GA
I drained out factory coolant from the radiator on my sister 2002 Tahoe (just hit 60k miles) and it has a very noticeable...odor. Can't quite say what it is, but I figured it was time to change it. I'd love to test it but don't have the money to spare.
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#2591981 - 04/06/12 06:41 PM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12]
bullwinkle Offline


Registered: 10/09/04
Posts: 6302
Loc: Cincinnati, OH, USA
If standard green AF is added to Dex it'll stink something awful (and start gelling up)-just make sure you flush the devil out of it.
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#2600019 - 04/15/12 07:43 AM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: PandaBear]
Dan55 Offline


Registered: 06/07/08
Posts: 846
Loc: jersey
Dex has not changed ,got that from Chevron Tech line last year.


Edited by Dan55 (04/15/12 07:43 AM)
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#2600131 - 04/15/12 10:59 AM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: PandaBear]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 18105
Loc: Sunny Florida
Originally Posted By: PandaBear
Originally Posted By: SteveSRT8
Dex used to have issues but it flat out does not anymore. Even Ford is using it now.


Did they reformulate it? or did the cooling system design change?


As noted above^^^ it appears to be the same formula.

The real problem was gaskets. Dex isn't the big stinker the Internet has portrayed it as.
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#2600342 - 04/15/12 04:08 PM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12]
xxch4osxx Offline


Registered: 03/11/09
Posts: 2216
Loc: Cedarbrae, Ontario
The cooling system in my 2004 Silverado is spotless and has had Dex the whole time. I had thought about changing it to something else, but decided not too as obviously the Dex was doing a good job.
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#2787102 - 10/29/12 10:07 AM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: SteveSRT8]
Bgallagher Offline


Registered: 04/17/12
Posts: 2724
Loc: Boston, MA
Originally Posted By: SteveSRT8
Originally Posted By: PandaBear
Originally Posted By: SteveSRT8
Dex used to have issues but it flat out does not anymore. Even Ford is using it now.


Did they reformulate it? or did the cooling system design change?


As noted above^^^ it appears to be the same formula.

The real problem was gaskets. Dex isn't the big stinker the Internet has portrayed it as.


+1 Dex is EXCELLENT at keeping cooling systems clean but once a foreign coolant or air is introduced it can cause issues. The issues with the older vehicles were that the acids used in Dexcool would eat away at the gasket material (namely the Lower Intake and Head gaskets.) For the cars that experienced this, AC Delco and other have created new gaskets that are made of materials that wont corrode. Essentially fixing the issue. The only issue is that so many people are afraid of it and frankly I would chaulk it up to their ignorance. If you are truely worried I would switch to Peak Global.
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#3049956 - 06/30/13 01:40 AM Re: GM Dex-Cool, 134K miles, 04 Chevy Tahoe [Re: dhellman12]
901Memphis Offline


Registered: 08/14/10
Posts: 11740
Loc: Northern Kentucky
Is this the FF? How did the concentration end up so high?
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