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Discussion Starter #1
Hello All,
My '08 2500HD 6.0L is now 5 years old and I believe that the coolant needs to be changed. I'm no where near the mileage (my truck has 34K and it's a 100K mile interval for the coolant), but I'm now past the time and I would like to get this taken care of while it's still warm enough to work on it comfortably. In prepping to do the project I discovered that the radiator has no drain petcock on it, which I think is really weird. The amount of work now required to do the project is making me do a gut check. Do I go the easy route and just replace the Dexcool or do I go for the big flush and conversion to the standard ethylene glycol coolant/antifreeze? I had heard that a lot of people had trouble with the Dexcool, but apparently those issues have gone away? It will take several flushes to call all the Dexcool out of there, which is going to make this project a big production in my opinion. What's everybody's thoughts on this?
Thanks,
Adam.
 

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Tileman's Boys
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1,094 Posts
I call bs run a test on the fluid if its in spec top it off with multi vehicle and run it.
 

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Registered
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748 Posts
Green or global. Pull the lower rad hose, just like a radiator drain. And you should have block drains, pretty quick project.
 

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LetsTalkSnow.com - Travel & Bar Consultant
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2,029 Posts
Just a warning................

Many newer GM radiators have what looks like a plastic screw-in drain plug
in the plastic side tank. DO NOT try to unscrew this "plug"!
It is sonic welded into the side tank and cannot be removed!

Its best to just pull the lower hose to drain the system !

*Ask me how I know!*
 

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Registered
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401 Posts
Just a warning................

Many newer GM radiators have what looks like a plastic screw-in drain plug
in the plastic side tank. DO NOT try to unscrew this "plug"!
It is sonic welded into the side tank and cannot be removed!

Its best to just pull the lower hose to drain the system !

*Ask me how I know!*
How do you know?
 

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LetsTalkSnow.com - Travel & Bar Consultant
Joined
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2,029 Posts
LOL!

The kid decided to do his own coolant change and instead of getting
"dirty" under the car dropping the hose he found that "plug" and tried
to unscrew it.

So he broke the ears off it trying to unscrew it and either cracked
the tank or loosened the tank off the core horsing on the plug so
the radiator started leaking badly and its toast !!!!!!!!!!

Of course these new rads are fragile junk and the tanks are just
"clamped" to the core so a successful repair or re-core is risky!

Gonna search out a brass/copper replacement.................

OTOH: I did get the plow out of the mothballs and of course it didn't work
but with the help of the Western troubleshooting flo-chart I replaced the
solenoid and it works just dandy !!!!!!!!!!!!
Put it in the garage and gave it a new paint job and a fluid change and a bit
of lube on the joints and now its PRETTY and ready for snow!
 
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