Pontiac Grand Prix Forums : Grandprix

So how many of you are still using Dex coolant? Why?

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debadged, clear corners, 20% tint, tinted tails, vibrant performance tips, red painted calipers, Fig. grills, autometer guages, PFYC 3 pod A pillar, SLP CAI, 2.5" DP, SD Hood, SD front air damn, Gen I spoiler, 17X8 Borbet Type M rims, engine upgrades soon!
My Cardomain

been gone with that junk since a few months into buying my car.

green stuff!

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98 XGT - sold
06 impreza 2.5i 5 speed - stock, slow, and awesome

I'm using the aftermarket dex cool

im using prestone yellow with whatever amountf of dex i wasnt missing after my fixing the leaking lim gaskets..

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245 HP/326 TQ
K&N CAI | 1.9 RR's | 105#'s | TOG Headers | Borla Catback | AL 104's | 8.5mm wires | 180* Thermo | 3.4 | AEM Wideband | Poly Mounts | Wideband Tuned | SSC Springs

I am, becuase there is no reason to switch.

I am, but the question I want to know is if mine is still the stock Dex cool.

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Regal GS Intake Headers 3.5mps pulley 1.9 rockers

I quit using it a long time ago after I dug a beach out of my radiator from all its deposits.

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Scotty Hall
2001 Pontiac Grand Prix GTP
It whines a lot, but I like it.

The only place success comes before work is in the dictionary.

Great spirits have always found violent opposition from mediocre minds.

I still run it. Never really considered switching.

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00 GTP w/ TDC fwi, plog, ported rear mani, 3in catless dp, 180 thermo, auto lite 104s, clevite 77 rod and main bearings. PCM and 3.4 coming very soon!

No sh!t!!

I'm now using Prestone!!

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3.4", 3" cated DP, SLP Air box, TB spacer, 180* Thermo, "Bilemke Tuning".

Still using it. Like others, have had no reason to switch.

Here is more reason Dex-Cool will never ever ever ever see use in any care I own.









Where did this come from you may be asking?

Well I decided it was such a nice day out and I got home a little early from work and had nothing else going on so I went out to pull the heads off my engine so I could get them ready to be cleaned up and work some magic on them.

I pulled the front side head (the 1-3-5) and was inspecting things over, looking at the heads and then looking at the pistons then the coolant passages. I noticed some grit around the #5 cylinder. So I got my trusty Craftsman seal pic and was just digging around to see if it was solidified or what. I dig a little, I dig a little more and I keep digging and find that there is a LOT more in there than I though. So I started digging out what I could. What you see in the pictures above isnt all of it. There is at least that much more left in there that I didnt have the patience to keep digging out.

Say what you will, make whatever argument you want for or against Dex-Cool but there is one very simple fact. Never EVER have I seen a green coolant do this or any of the non-long life coolants do this. The Grand Prix was the first vehicle I have ever owned that had Dex-Cool in it and I guarantee you if I ever get another that has that crap in it, it will be drained as soon as I drive the car home and the engine has cooled down.

Oh, heres another thing. I had the coolant system flushed, professionally, TWICE when I had cooling issues related to my radiator being buried in this same crap. I also have a coolant filter on my car and STILL this stuff was in there. Does that tell you anything about how badly this stuff settles where it may and entrenches itself in your cooling system and your engine?

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Scotty Hall
2001 Pontiac Grand Prix GTP
It whines a lot, but I like it.

The only place success comes before work is in the dictionary.

Great spirits have always found violent opposition from mediocre minds.

DEX COOL is the worst, within 5 days of owning my GTP I had it flushed and refilled with the prestone(yellow) extended life...
Here's some dex cool info if your still undecided...
The potential role of DEX-COOL®
for descriptions of problems from everyday people, check this site, be prepared, theres lots of incidents to read...
Consumer complaints about DexCool in GM Engines
you must also know that gm finally settled a lawsuit pertaining to those who suffered losses due to the use of dex cool.... Maybe some here are owed a little off the suit.
Dex Cool Litigation Website
or here...
Summary of the GM DEX-COOL—Class Action Tentative Settlement
if your still in question about dex cool, then ask your local dealer if any of the new cars come with dex cool in them....they don't, it's not been in any new cars since 04....
I highly recomend flushing that garbage out, and then doing so again every 500 miles or so until the brown sludgy garbage is no longer visible... for a good antifreeze try the prestone ext. life, it's yellowish and mixes with anything, so far I've heard of no problems with it...
good luck

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2002 Galaxy Silver 4dr. GTP...supercharger heaven.
IM ON IT!!!!!!

mine is an orangish color? what do i have?

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Thrasher intake, Headers, Flowmaster 40's, F body brakes, slotted rotors, GMPP kit, 20 in Velocity 925's, Premier deck, Memphis highs and mids, Memphis amps, 2 DD 1510 subs.... 3.4 and tune on the way.

Dark orange?

Dex cool is orange, when new it's like Kool aid, when older it gets brownish

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2002 Galaxy Silver 4dr. GTP...supercharger heaven.
IM ON IT!!!!!!

yea more like orange kool aid color,im assuming i should get that crap outta my car.

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Thrasher intake, Headers, Flowmaster 40's, F body brakes, slotted rotors, GMPP kit, 20 in Velocity 925's, Premier deck, Memphis highs and mids, Memphis amps, 2 DD 1510 subs.... 3.4 and tune on the way.

yea it's dex cool no doubt...is there any brown residue on the bottom of the cap??? if so, it's all over you're cooling system....
check the links i've posted, then you decide if you want to keep it in there

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2002 Galaxy Silver 4dr. GTP...supercharger heaven.
IM ON IT!!!!!!

Looks like when I get some free time, I'll be doing a switch. After a few good flushes, you think most of that stuff will be out?

the more flushes the better, i'll be doing mine again next week, it's third so far and i still keep getting the residue on the cap... I do remember seeing a post on this site a while back for a coolent filter that connects just before the thermostat on the top rad hose... I think Scotty may have one already, ask him about it as it may save on many flushes....I should get one as well...
let me know what you come up with....

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2002 Galaxy Silver 4dr. GTP...supercharger heaven.
IM ON IT!!!!!!

Hey thanks. Yeah, I'll get with him and see what's up with it. I'm sure it's got quite a bit in there with having 92,000 on her.