2002 Suburban - Flush Dex-cool Anti Freeze

smams1962 · July 18, 2010

I want to remove 100% of DEX-COOL antifreeze from 126,000 mile radiator/motor and replace with 50/50 Prestone. I was told all this type of antifreeze must be removed. What is the procedure on doing this??

[email protected] · July 18, 2010

I want to remove 100% of DEX-COOL antifreeze from 126,000 mile radiator/motor and replace with 50/50 Prestone. I was told all this type of antifreeze must be removed. What is the procedure on doing this??

There's a drain cock on the drivers side bottom of the radiator, with a hose attached to it. Drain it from there, then go buy some system flush from wal-mart or an auto parts store a and follow the directions to make sure you get it ALL out. Why do you want to do away with dex-cool, I might ask? Is it getting rusty or discolored? I did away with it myself following this procedure, I just want to know why you are doing it. Make sure you flush it all out, before adding any antifreeze to it, because that will just be wasted anti-freeze and you'll have to do it over again.

jblakeney · July 18, 2010

What's the deal with DexCool?? Some of the best systems I have ever owned were filled with dexcool. Now when I say best I mean that they were he highest mileage and longest lived systems without replacing components in the system.

DexCool is like any other antifreeze in the fact it should be changed yearly. Forget the 10 year/100,000 mile BS and change it yearly.

My 1995 blazer was well in the 250k's when I sold it. At that time I replaced for the first time the water pump and thermostat. The system was flushed, drained, and refilled with a 50/50 mix of DexCool every fall.

That is my two cents on the whole green vs yellow vs purple vs red vs clear vs orange antifreeze. Just keep the system maintained and you will not have problems.

Jbo

ken1mod · July 18, 2010

Gentlemen,

I have two dex cool vehicles. Both perfect. The thought that dex cool is bad is manure.

Ken

smams1962 · July 18, 2010

the inlet/outlet heater hoses have quick disconnects. I want to remove the heater hoses and reverse flush the heater core. Which heater hose is the inlet? Driver or passenger side?

redvett · July 18, 2010

If Dexcool is so bad why are all MFR's going to it even Ford and Chrysler.

Nothing wrong with Dexcool just the owner/operators.

dewfpo · July 18, 2010

If your completely changing it out to another type, refill the system 3-4-5 times with clean water to get it all out/diluted before you pour some other type of coolant in there.

DEWFPO

dlstewart01 · July 18, 2010

A whole lot of trouble to go to an antifreeze that is not as good...me and the missus have half a million miles on Dex-Cool with not one issue..

bossier62guy · July 18, 2010

If your completely changing it out to another type, refill the system 3-4-5 times with clean water to get it all out/diluted before you pour some other type of coolant in there.

DEWFPO

Even that won't do it completely....you need to open up the plugs on the engine block too if you want it all out. I agree w/ some of the others here though....total waste of time.

jblakeney · July 19, 2010

If your completely changing it out to another type, refill the system 3-4-5 times with clean water to get it all out/diluted before you pour some other type of coolant in there.

DEWFPO

Even that won't do it completely....you need to open up the plugs on the engine block too if you want it all out. I agree w/ some of the others here though....total waste of time.

Utter waste of time flush odmr drain and refill with 50/50 dexcool mix. I use distilled water in my systems.... I have way too many miles and years on dex-cool it is good stuff.... but does not like oxygen in the system from what I have heard from some GM techs.

Jbo

smams1962 · July 19, 2010

Can someone tell me which heater hose is the inlet coming out of the firewall? Driver or passenger side? The inlet/outlet heater hoses have quick disconnects. I want to remove the heater hoses and reverse flush the heater core.

Matt_ · July 19, 2010

it sure is good to know that most of the members here are logical and realize theres nothing wrong with Dex... just needs proper maintenance like anything else.

Can someone tell me which heater hose is the inlet coming out of the firewall? Driver or passenger side? The inlet/outlet heater hoses have quick disconnects. I want to remove the heater hoses and reverse flush the heater core.

its really easy to figure out... start your truck up, let it get to operating temp, turn on the heat. One line will be hotter than the other.... thats the inlet.

[email protected] · July 19, 2010

Can someone tell me which heater hose is the inlet coming out of the firewall? Driver or passenger side? The inlet/outlet heater hoses have quick disconnects. I want to remove the heater hoses and reverse flush the heater core.

The inlet will be a slightly smaller fitting, the outlet is the larger one. It's your truck and you can do whatever the hell you want with it! That's the beauty of owning something.