View Full Version : antifreeze question

04-08-2011, 03:18 PM
in gunna flush my radiator soon and was wondering what kind of antifreeze would be best for me to use. can i use like prestone 50/50 or does it have to be a specific kind. also should i get a new thermostat/gasket while im at it?

04-08-2011, 03:21 PM
depending on the mileage then you should change the thermostat and i dont think any old antifreeze will work you need dexcool

04-08-2011, 03:22 PM
well its got 218k and im pretty sure its got a 160* tstat in it already

04-08-2011, 07:28 PM
Unless you want to completely and very thoroghly flush out the system, you should just stick with dexcool.

And the 50/50 stuff is a ripoff. Think about it, you're only getting 1/2 gallon of coolant, and paying for half a gallon of water when you buy the 50/50 stuff.

I just bought the unmixed dexcool at walmart, it was 13.84 for the gallon. The 50/50 stuff was a little under 12 bucks. Then I bought a gallon of distilled water for 83 cents.

Now I can mix up TWO gallons of 50/50 dexcool for only about 3 bucks more than one gal of the premixed stuff.

I pickup up a new thermostat and radiator hoses too. Reason being I'm taking it all apart to change my waterpump, so I figure I might as well just change everything now. The car has 104k and I don't know if any of that stuff has ever been changed. I'm thinking prob not.

And FYI - the stock temp thermo (which comes in the housing) was 20 bucks from Autozone, and the lower rad hose was 17.50, and the upper was 10 bucks.

04-08-2011, 08:37 PM
Our cars need DexCool.

04-08-2011, 09:00 PM
thanks guys so should i just get a gallon of dexcool and mix with a gallon or so of water or run straight

04-09-2011, 12:21 PM
50/50 dexcool and distilled water.

04-09-2011, 04:17 PM
Dexcool here and never had any problems with it in ANY of my 3 ls1 cars. I got mine at autozone and just mixed with water.

04-10-2011, 01:26 AM
whatever you get make sure its aluminum block compliant.

04-10-2011, 04:48 AM
just flush it and use some prestone universal coolant. Dexcool was the worst idea ever

04-10-2011, 03:47 PM
universal coolant is even worse than dexcool.

04-10-2011, 04:01 PM
universal coolant is even worse than dexcool.Say what????? Don't tell me you're at it again?

04-10-2011, 04:17 PM
and what are you doing? please dont tell me your here to defend universal coolant and bash dexcool...

04-10-2011, 05:41 PM
and what are you doing? please dont tell me your here to defend universal coolant and bash dexcool...
Please explain hows its worse than Dexcool....then we'll chat......:D

Mr Incredible
04-11-2011, 09:20 AM
I have yet to see a bottle of modern green coolant that didn't say it was rated for aluminium engines. Antifreeze has come a long way in the last ten-twenty years.

Use whichever you want. You should flush your system regardless of what your run, but if you flush it's the perfect opportunity to go green. Dexcool goes bad when subjected to air infiltration. If your system is tight you can us Dexcool with impunity. If your system isn't tight and/or you find icky brown goo while you're working on your system, I'd go ahead and make the change to green. I have, and it suits me fine. Dexcool is NOT mandatory.

As for the straight and mix vs 50/50. Whatever suits your garage. I don't have to mix, I don't buy it that often, and it's quick and easy with no mixing or math. I have it available for the six vehicles in my driveway, plus anyone else that needs a top-off. No fussing around, just pour and forget it.

04-11-2011, 12:56 PM
for what it's worth ford is using the dexcool formula in the new mustangs, and i assume their other 2010/2011 models, you can easily look it up so you can't just say dexcool is crap. It's been in service for around 15 years and continues to be used.

I tend to disagree with the dexcool going bad with air, a lot of problems with dexcool and air had to do with cast iron blocks where rust would form in the cooling passages in the block then the coolant would wash it away and rust particles would float around in the system. But, if you have air in the cooling system or the cooling system does not hold pressure, that is the problem and any resulting cooling system problems aren't necessarily the fault of the coolant type.

the additives in dexcool are what make it a long life and a good coolant, specifically the 2-eha additive which is also what makes it incompatible with other coolants and incompatible with certain types of gasket materials (nylon/plastic). When you buy the universal antifreezes that can mix with any type of antifreeze, you are buying an antifreeze with a subset of additives that is common to all antifreezes, that is how it is "compatible" but you are getting less of a product than dexcool, less than a product of G05 which has silicate additives, and less than a product of the asian formula coolants which use phosphates.

04-11-2011, 05:33 PM
Dexcrap and Filtered water in every GM i have owned. Never had any issues.

04-11-2011, 05:57 PM
I steer clear of the dex-cool, it tends to break down quickly and produce the corrosive orange crud that is so prevalent. A source of why GM's are notorious for recurrent failure of their water pumps and corresponding bearings in them.

I would very thoroughly flush the entire system a couple times with water for 50-100 mile intervals and then run either evans or amsoil antifreeze at the 50/50 ratio. I have used the amsoil for a long time and it has proven to be nothing short of amazing compared the the stupid dex-cool gm uses.

04-20-2011, 05:08 PM
yes get the dexcool extended life, it should be red in color or like an orangish, get the full unmixed gallon and a gallon of distilled water, you don't wanna use tap water because your shit will rust out

04-20-2011, 05:15 PM
Thats not true, dexcool was made to be used with drinkable water. Thats its big claim to fame.

04-20-2011, 05:34 PM
Thats not true, dexcool was made to be used with drinkable water. Thats its big claim to fame.

made to be used with clean water...water straight from a well is drinkable, but not to be used with dexcool. with the variation in water quality that is considered "drinkable", your an idiot for using tap water.

just because dexcool isint idiot proof, doesnt mean its means your an idiot because it doesnt work for you.

The integrity of the coolant is dependent upon the quality of DEX-COOL® and water. DEXCOOL
® is a product which has enhanced protection capability as well as an extended service
interval. These enhanced properties may be jeopardized by combining DEX-COOL® with poor
quality water. If you suspect the water in your area of being poor quality, it is recommended you
use distilled or de-ionized water with DEX-COOL®.

04-20-2011, 05:52 PM
the dumbest thing GM did with Dexcool was leave it up to the owner of the car to decide what water is acceptable to put in the radiator.

i have city water here in Lima, but even when i get a glass of water straight from the tap, i can see little black specs floating around in it. i dont know what it is and i dont care, because the only thing i use it for is showering and brushing my teeth. whatever that black shit is, is not going to go anywhere near my cooling system regardless of what coolant is in it. but hey its "drinkable" so its good right? no.

thats where GM ran into problems. im assuming thats why they came out with the TSB here is to cover their asses. if you suspect poor quality water, use distilled water. how bout i just use distilled water anyways and avoid any problems? ok, works for me and has for years and years and will for years to come.

04-20-2011, 10:30 PM
its you're a idiot not your an idiot.................. born in 88 dexcool boob hehe.

04-21-2011, 01:57 PM
I guess when you were conceived they didn't have "clean drinking water", and your mom must have drank plenty of it.

04-21-2011, 05:05 PM
I guess when you were conceived they didn't have "clean drinking water", and your mom must have drank plenty of it.

with green or red coolant? LOL.

but that was harsh.