scorp508

Out of the 7 vehicles at my house the vette is the only one that uses green antifreeze still. Its a PIA to keep a 50% cut mixture of that hanging around amonst all the oragne dexcool. Any reason why I CAN'T change over to that if I get the cooling system flushed 100%?

NightRyder

!!!!!!!!!!!!!! you dont know!??!?!!?! i thought you knew everything! :smash:
:lol: :cheers: :thumbs: :leaving:

1989redvette

which reason would you like??? as far as dexcool it's a joke... it may run a bit cooler but thats about it... alot of gm techs highley discourage changing over to it from green antifreeze....first if you do not have all of the old out and i mean everydrop of it out it will react with each other and cause an acidic mixture...not good for aluminum or rubber seals... if you think you can 100% flush a cooling system you are fooling yourself...to many little hiiding spots...bottom of block passages heater ocre ...ect.... i would steer clear of it if i was you :yesnod:

John Row

Main reason for me is I pull the radiator every year, so I'd just end up dumping all that expensive orange stuff down the drain.

I guess you could capture it, strain it, and reuse it. Seems easier to keep a gallon of the green and mix it when you need it. JMHO.

Strick

Hey scorp, The GM answer is simple, if it came with Dexcool use it, if it didn't come with it don't change over to it. Some 96s came with it from the factory, besides it cost more and doesn't do well with the seal inside the OEM water pump (LT-1/4). We had a good discussion a week or so back. Bottom line, to my fellow Vette owner who has given me a lot of good advice, stay with the green stuff and distilled water. :yesnod: :chevy

GusBustamanteJr

You are bringing back ghosts for me Scorp....

I put in the Dex when I did the Top-end and SR in Dec. I too thought it would be better.

I started reading posts about what happens when it reacts with the green stuff, which can never really be flushed out completely, it is soaked and absorbed into seals and gaskets too. I also noticed a little fluid on the garage floor. I QUICKLY changed it back. I hope it was not to late, and that I wont have problems.

I think the only way to safely do it is if the engine is out and been machined like yours, and ALL new fresh gaskets and seals are put in.

But I dont think there is an advantage for the efort, risk, price, and peace of mind. In this case, I stick with I know works.

black bart

http://consumeraffairs.com/automotive/gm_dexcool.html

PeteL

1989redvette:

DexCool is 90% the same stuff as Green AF, it has no greater or lesser ability to remove heat from your engine.

This is true, in fact GM has a TSB which does not recommend using DexCool in pre 95 engines (or was that 94?).

I don't believe this to be true, and believe this falls into the Urban legend catagory. I e-mailed Texaco about this quite a while back and their engineer said the two could be mixed, hower the long life attributes of DexCool would be lost.


Scorp:

GM has made quite a few changes in their evolution to the use of DexCool in their fleet. Gasket changes, flow changes, venting, overflow location, pressurised containers, and many I don't know about.

Sometimes, it messes up. Most times it does not. When it does mess up, it can be really ugly.

I speculate that you have to be really careful with pressure, temperature, flow, and air in the system.

The green works pretty well, and we pretty much know what to expect from it in the pre-96 engines. I keep a couple jugs of the Green Texaco pre-mixed (with deionized H2O) around even though my C5 and my Truck use DexCool.

Pete

4DRSS

I wouldn't run DexCrap in any vehicle I owned, stick to the green stuff. :thumbs:

jackdaroofer

:cheers: I too thought you knew evrything! There have been many posts on Dexcool. Check them out. You csn enter the search function on the Forum to help you! But you know that!

Or are you just "puttting us on"?

Increase post count by 1 everytime you post :D

:seeya

:steering:

Dr. Evil

I see it every day at work. I run the green stuff in mine.

Wheelman

Make sure you get it flushed all the way.......thats what killed my last motor..... :banghead: :banghead:

Ericthewolf

GM doesn't reccomend it in a vehicle not made for it.. Just a suggestion.. I switched mine the other direction.. I can come up with about 10 reasons not to. But I don't have all nite.. LOL

Mervz

Brian, i'll explain it to you tomorrow on AIM, but DON'T. JUST DON'T. :nono:

People who switch either way CAN AND WILL run into HUGE problems down the road. :nonod:


[Modified by Mervz, 9:59 PM 6/30/2003]

Strick

Hey scorp,
We have so much info that should send up a warning flag to all of us C-4 guys about Dexcool use. Is there a way to post a warning for a while that stays on the top of the listings for a period of time?

silver & red CE

I use it, I've switched vehicles over to it, no problems with over 200K miles of Dexcool fun. I think it's getting time to add this thread to urban legends.

Eric

Strick

That's great to have over 200K on your Vette. You're getting your money's worth. :cheers: One thing I've learned about Vettes; you can Never use the words Always or Never when talking about Vettes or people.

0ski_dwn_it

I put the orange stuff in my new engine....after running the green stuff....should I flush it and switch back? :confused:

Mervz

Guys, here's what i told Scorp.

Dexcool and regular Antifreeze are not made alike. Dexcool is a less toxic coolent, but does have some side effects.

1. GM claims for it to last longer, and it does, but only in certain situations.
- Dexcool that is exposed to any type of air will start to gunk up. This means, if your cooling system isn't 100% free of air at all times, eventually it will start to develop "chunks". My 99 S-10's heater core got clogged becuase i didn't keep my system burped. I had to have it professionally flushed.

2. Dexcool and the "Green stuff" DO NOT MIX. You think Dexcool is "bad" on its own, try adding some of the green stuff to it. You'll get a nice gel. Yes, like jello. :eek:

3. Neither green or dexcool can totally be removed from the block. We all know the block is semi porus and no amount of chemical flush would remove it. Eventually, this would seep back out into the cooling system, no matter how small the amount, and would mix with the other type of coolent, causing, yes, you guessed it a gel. A small amount no less, but still that introduces the possibility of something clogging, and will reduce the life of the coolent.


The only real HUGE advantage Dexcool has over green is its less toxic makeup. Otherwise, both used in an identical enviroment, Dexcool *should* last longer. Although, i would never to over 50,000 miles on either.

I hope this clears this up for people. :)

Mervz

If you start with Dexcool, you should have no troubles at all. Its only the people who switch who see the big problems. My 95 uses it, and i have no complaints. :)